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721242 = 232172357
BaseRepresentation
bin10110000000101011010
31100122100200
42300011122
5141034432
623243030
76062514
oct2600532
91318320
10721242
11452975
122a9476
131c3392
1414abb4
15e3a7c
hexb015a

721242 has 24 divisors (see below), whose sum is σ = 1655316. Its totient is φ = 226176.

The previous prime is 721229. The next prime is 721243. The reversal of 721242 is 242127.

It can be written as a sum of positive squares in 2 ways, for example, as 720801 + 441 = 849^2 + 21^2 .

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

It is a d-powerful number, because it can be written as 73 + 2 + 217 + 1 + 48 + 219 .

It is not an unprimeable number, because it can be changed into a prime (721243) 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, 873 + ... + 1484.

2721242 is an apocalyptic number.

721242 is an abundant number, since it is smaller than the sum of its proper divisors (934074).

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

721242 is a wasteful number, since it uses less digits than its factorization.

721242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2382 (or 2379 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 721242 is about 849.2596776016. The cubic root of 721242 is about 89.6796014808.

Adding to 721242 its reverse (242127), we get a palindrome (963369).

The spelling of 721242 in words is "seven hundred twenty-one thousand, two hundred forty-two", and thus it is an iban number.

Divisors: 1 2 3 6 9 17 18 34 51 102 153 306 2357 4714 7071 14142 21213 40069 42426 80138 120207 240414 360621 721242