400838686618 has 16 divisors (see below), whose sum is σ = 620381188224. Its totient is φ = 194132880000.

The previous prime is 400838686553. The next prime is 400838686621. The reversal of 400838686618 is 816686838004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21971508 + ... + 21989743.

It is an arithmetic number, because the mean of its divisors is an integer number (38773824264).

Almost surely, 2^400838686618 is an apocalyptic number.

400838686618 is a deficient number, since it is larger than the sum of its proper divisors (219542501606).

400838686618 is a wasteful number, since it uses less digits than its factorization.

400838686618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43961397.

The product of its (nonzero) digits is 10616832, while the sum is 58.

The spelling of 400838686618 in words is "four hundred billion, eight hundred thirty-eight million, six hundred eighty-six thousand, six hundred eighteen".