400544870 has 32 divisors (see below), whose sum is σ = 793898496. Its totient is φ = 144287200.

The previous prime is 400544863. The next prime is 400544933. The reversal of 400544870 is 78445004.

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 15 ways as a sum of consecutive naturals, for example, 5246 + ... + 28785.

It is an arithmetic number, because the mean of its divisors is an integer number (24809328).

Almost surely, 2^400544870 is an apocalyptic number.

400544870 is a deficient number, since it is larger than the sum of its proper divisors (393353626).

400544870 is a wasteful number, since it uses less digits than its factorization.

400544870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34156.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 400544870 is about 20013.6171143549. The cubic root of 400544870 is about 737.1407009768.

Adding to 400544870 its reverse (78445004), we get a palindrome (478989874).

The spelling of 400544870 in words is "four hundred million, five hundred forty-four thousand, eight hundred seventy".