42921618 has 16 divisors (see below), whose sum is σ = 86202336. Its totient is φ = 14247360.

The previous prime is 42921601. The next prime is 42921643. The reversal of 42921618 is 81612924.

42921618 is nontrivially palindromic in base 15.

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, 13396 + ... + 16287.

It is an arithmetic number, because the mean of its divisors is an integer number (5387646).

Almost surely, 2^42921618 is an apocalyptic number.

42921618 is an abundant number, since it is smaller than the sum of its proper divisors (43280718).

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

42921618 is a wasteful number, since it uses less digits than its factorization.

42921618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29929.

The product of its digits is 6912, while the sum is 33.

The square root of 42921618 is about 6551.4592267677. The cubic root of 42921618 is about 350.1268057531.

The spelling of 42921618 in words is "forty-two million, nine hundred twenty-one thousand, six hundred eighteen".