402209423618 has 18 divisors (see below), whose sum is σ = 617730220809. Its totient is φ = 196409023272.

The previous prime is 402209423593. The next prime is 402209423639. The reversal of 402209423618 is 816324902204.

It can be written as a sum of positive squares in 2 ways, for example, as 240253884649 + 161955538969 = 490157^2 + 402437^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=448447.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38561228 + ... + 38571656.

Almost surely, 2^402209423618 is an apocalyptic number.

402209423618 is a deficient number, since it is larger than the sum of its proper divisors (215520797191).

402209423618 is an frugal number, since it uses more digits than its factorization.

402209423618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20946 (or 10474 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The spelling of 402209423618 in words is "four hundred two billion, two hundred nine million, four hundred twenty-three thousand, six hundred eighteen".