400551012 has 18 divisors (see below), whose sum is σ = 1012504038. Its totient is φ = 133516992.

The previous prime is 400551001. The next prime is 400551043. The reversal of 400551012 is 210155004.

It can be written as a sum of positive squares in only one way, i.e., 212751396 + 187799616 = 14586^2 + 13704^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×400551012² = 320882226428448288, which contains 22 as substring.

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 (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5563173 + ... + 5563244.

Almost surely, 2^400551012 is an apocalyptic number.

It is an amenable number.

400551012 is an abundant number, since it is smaller than the sum of its proper divisors (611953026).

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

400551012 is a wasteful number, since it uses less digits than its factorization.

400551012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11126427 (or 11126422 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 400551012 is about 20013.7705592924. The cubic root of 400551012 is about 737.1444687569.

The spelling of 400551012 in words is "four hundred million, five hundred fifty-one thousand, twelve".