400412538 has 32 divisors (see below), whose sum is σ = 891129600. Its totient is φ = 133272288.

The previous prime is 400412533. The next prime is 400412539. The reversal of 400412538 is 835214004.

400412538 is a `hidden beast` number, since 400 + 4 + 1 + 253 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400412531) 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, 33670 + ... + 43982.

It is an arithmetic number, because the mean of its divisors is an integer number (27847800).

Almost surely, 2^400412538 is an apocalyptic number.

400412538 is an abundant number, since it is smaller than the sum of its proper divisors (490717062).

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

400412538 is a wasteful number, since it uses less digits than its factorization.

400412538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11043 (or 11037 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 400412538 is about 20010.3107921891. The cubic root of 400412538 is about 737.0595131956.

The spelling of 400412538 in words is "four hundred million, four hundred twelve thousand, five hundred thirty-eight".