400421412 has 72 divisors (see below), whose sum is σ = 1027458432. Its totient is φ = 131476800.

The previous prime is 400421407. The next prime is 400421423. The reversal of 400421412 is 214124004.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 928837 + ... + 929267.

It is an arithmetic number, because the mean of its divisors is an integer number (14270256).

Almost surely, 2^400421412 is an apocalyptic number.

It is an amenable number.

400421412 is an abundant number, since it is smaller than the sum of its proper divisors (627037020).

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

400421412 is a wasteful number, since it uses less digits than its factorization.

400421412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 764 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 400421412 is about 20010.5325266471. The cubic root of 400421412 is about 737.0649580949.

Adding to 400421412 its reverse (214124004), we get a palindrome (614545416).

The spelling of 400421412 in words is "four hundred million, four hundred twenty-one thousand, four hundred twelve".