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400013213 = 17191238431
BaseRepresentation
bin10111110101111…
…011011110011101
31000212200202222012
4113311323132131
51304400410323
6103405401005
712625025165
oct2765733635
91025622865
10400013213
11195884936
12b1b69165
1364b47612
143b1a95a5
15251b7678
hex17d7b79d

400013213 has 8 divisors (see below), whose sum is σ = 445835520. Its totient is φ = 356667840.

The previous prime is 400013191. The next prime is 400013239. The reversal of 400013213 is 312310004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400013213 - 26 = 400013149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400013113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618893 + ... + 619538.

It is an arithmetic number, because the mean of its divisors is an integer number (55729440).

Almost surely, 2400013213 is an apocalyptic number.

It is an amenable number.

400013213 is a deficient number, since it is larger than the sum of its proper divisors (45822307).

400013213 is a wasteful number, since it uses less digits than its factorization.

400013213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238467.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 400013213 is about 20000.3303222722. The cubic root of 400013213 is about 736.8144124901.

Adding to 400013213 its reverse (312310004), we get a palindrome (712323217).

The spelling of 400013213 in words is "four hundred million, thirteen thousand, two hundred thirteen".

Divisors: 1 17 19 323 1238431 21053327 23530189 400013213