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401221206 = 23229768623
BaseRepresentation
bin10111111010100…
…010011001010110
31000221222011000200
4113322202121112
51310203034311
6103451321330
712641216061
oct2772423126
91027864020
10401221206
1119652a481
12b2450246
136517b3c9
143b4018d8
1525355556
hex17ea2656

401221206 has 24 divisors (see below), whose sum is σ = 899290080. Its totient is φ = 129128496.

The previous prime is 401221159. The next prime is 401221207. The reversal of 401221206 is 602122104.

It is a super-2 number, since 2×4012212062 = 321956912288188872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401221207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383790 + ... + 384833.

It is an arithmetic number, because the mean of its divisors is an integer number (37470420).

Almost surely, 2401221206 is an apocalyptic number.

401221206 is an abundant number, since it is smaller than the sum of its proper divisors (498068874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

401221206 is a wasteful number, since it uses less digits than its factorization.

401221206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768660 (or 768657 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 401221206 is about 20030.5068832519. The cubic root of 401221206 is about 737.5553648372. Note that the first 3 decimals are identical.

It can be divided in two parts, 40122 and 1206, that added together give a triangular number (41328 = T287).

The spelling of 401221206 in words is "four hundred one million, two hundred twenty-one thousand, two hundred six".

Divisors: 1 2 3 6 9 18 29 58 87 174 261 522 768623 1537246 2305869 4611738 6917607 13835214 22290067 44580134 66870201 133740402 200610603 401221206