400687042 has 32 divisors (see below), whose sum is σ = 729001728. Its totient is φ = 161243136.

The previous prime is 400687037. The next prime is 400687057. The reversal of 400687042 is 240786004.

It is a junction number, because it is equal to n+sod(n) for n = 400686995 and 400687013.

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, 114178 + ... + 117634.

It is an arithmetic number, because the mean of its divisors is an integer number (22781304).

Almost surely, 2^400687042 is an apocalyptic number.

400687042 is a deficient number, since it is larger than the sum of its proper divisors (328314686).

400687042 is a wasteful number, since it uses less digits than its factorization.

400687042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 400687042 is about 20017.1686809099. The cubic root of 400687042 is about 737.2279058307.

The spelling of 400687042 in words is "four hundred million, six hundred eighty-seven thousand, forty-two".