38646618 has 16 divisors (see below), whose sum is σ = 79958880. Its totient is φ = 12437936.

The previous prime is 38646617. The next prime is 38646623. The reversal of 38646618 is 81664683.

It is a happy number.

It is a super-2 number, since 2×38646618² = 2987122165675848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 38646618.

It is not an unprimeable number, because it can be changed into a prime (38646613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110880 + ... + 111227.

It is an arithmetic number, because the mean of its divisors is an integer number (4997430).

Almost surely, 2^38646618 is an apocalyptic number.

38646618 is an abundant number, since it is smaller than the sum of its proper divisors (41312262).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38646618 is a wasteful number, since it uses less digits than its factorization.

38646618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222141.

The product of its digits is 165888, while the sum is 42.

The square root of 38646618 is about 6216.6404110259. The cubic root of 38646618 is about 338.0937673861.

The spelling of 38646618 in words is "thirty-eight million, six hundred forty-six thousand, six hundred eighteen".