400401012 has 24 divisors (see below), whose sum is σ = 1019202912. Its totient is φ = 121333600.

The previous prime is 400400981. The next prime is 400401019. The reversal of 400401012 is 210104004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400401019) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1516539 + ... + 1516802.

It is an arithmetic number, because the mean of its divisors is an integer number (42466788).

Almost surely, 2^400401012 is an apocalyptic number.

It is an amenable number.

400401012 is an abundant number, since it is smaller than the sum of its proper divisors (618801900).

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

400401012 is a wasteful number, since it uses less digits than its factorization.

400401012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033359 (or 3033357 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 400401012 is about 20010.0227885927. The cubic root of 400401012 is about 737.0524409650.

Adding to 400401012 its reverse (210104004), we get a palindrome (610505016).

The spelling of 400401012 in words is "four hundred million, four hundred one thousand, twelve".