400512945 has 64 divisors (see below), whose sum is σ = 788797440. Its totient is φ = 169356288.

The previous prime is 400512941. The next prime is 400512947. The reversal of 400512945 is 549215004.

It is not a de Polignac number, because 400512945 - 2² = 400512941 is a prime.

It is a super-2 number, since 2×400512945² = 320821238225146050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400512941) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 103414 + ... + 107216.

It is an arithmetic number, because the mean of its divisors is an integer number (12324960).

Almost surely, 2^400512945 is an apocalyptic number.

It is an amenable number.

400512945 is a deficient number, since it is larger than the sum of its proper divisors (388284495).

400512945 is a wasteful number, since it uses less digits than its factorization.

400512945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 400512945 is about 20012.8195164999. The cubic root of 400512945 is about 737.1211161197.

Adding to 400512945 its reverse (549215004), we get a palindrome (949727949).

The spelling of 400512945 in words is "four hundred million, five hundred twelve thousand, nine hundred forty-five".