400031000 has 32 divisors (see below), whose sum is σ = 936074880. Its totient is φ = 160012000.

The previous prime is 400030993. The next prime is 400031041. The reversal of 400031000 is 130004.

It is a super-2 number, since 2×400031000² = 320049601922000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 199016 + ... + 201015.

It is an arithmetic number, because the mean of its divisors is an integer number (29252340).

Almost surely, 2^400031000 is an apocalyptic number.

400031000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400031000 is an abundant number, since it is smaller than the sum of its proper divisors (536043880).

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

400031000 is a wasteful number, since it uses less digits than its factorization.

400031000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400052 (or 400038 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 400031000 is about 20000.7749849850. The cubic root of 400031000 is about 736.8253333991.

Adding to 400031000 its reverse (130004), we get a palindrome (400161004).

The spelling of 400031000 in words is "four hundred million, thirty-one thousand".