400545531 has 12 divisors (see below), whose sum is σ = 578782152. Its totient is φ = 266930496.

The previous prime is 400545521. The next prime is 400545533. The reversal of 400545531 is 135545004.

It is not a de Polignac number, because 400545531 - 2¹¹ = 400543483 is a prime.

It is a super-2 number, since 2×400545531² = 320873444808143922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400545495 and 400545504.

It is not an unprimeable number, because it can be changed into a prime (400545533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23475 + ... + 36771.

It is an arithmetic number, because the mean of its divisors is an integer number (48231846).

Almost surely, 2^400545531 is an apocalyptic number.

400545531 is a deficient number, since it is larger than the sum of its proper divisors (178236621).

400545531 is a wasteful number, since it uses less digits than its factorization.

400545531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16650 (or 16647 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 400545531 is about 20013.6336281046. The cubic root of 400545531 is about 737.1411064659.

The spelling of 400545531 in words is "four hundred million, five hundred forty-five thousand, five hundred thirty-one".