400239012 has 48 divisors (see below), whose sum is σ = 959999040. Its totient is φ = 129712128.

The previous prime is 400239011. The next prime is 400239013. The reversal of 400239012 is 210932004.

It is an interprime number because it is at equal distance from previous prime (400239011) and next prime (400239013).

It is a super-2 number, since 2×400239012² = 320382533453472288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400239012.

It is not an unprimeable number, because it can be changed into a prime (400239011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118564 + ... + 121892.

It is an arithmetic number, because the mean of its divisors is an integer number (19999980).

Almost surely, 2^400239012 is an apocalyptic number.

It is an amenable number.

400239012 is an abundant number, since it is smaller than the sum of its proper divisors (559760028).

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

400239012 is a wasteful number, since it uses less digits than its factorization.

400239012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 3610 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 400239012 is about 20005.9744076613. The cubic root of 400239012 is about 736.9530251304.

The spelling of 400239012 in words is "four hundred million, two hundred thirty-nine thousand, twelve".