18618738 has 16 divisors (see below), whose sum is σ = 37279776. Its totient is φ = 6199200.

The previous prime is 18618737. The next prime is 18618739. The reversal of 18618738 is 83781681.

It is an interprime number because it is at equal distance from previous prime (18618737) and next prime (18618739).

It is a self number, because there is not a number n which added to its sum of digits gives 18618738.

It is not an unprimeable number, because it can be changed into a prime (18618731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9438 + ... + 11238.

It is an arithmetic number, because the mean of its divisors is an integer number (2329986).

Almost surely, 2^18618738 is an apocalyptic number.

18618738 is an abundant number, since it is smaller than the sum of its proper divisors (18661038).

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

18618738 is a wasteful number, since it uses less digits than its factorization.

18618738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3529.

The product of its digits is 64512, while the sum is 42.

The square root of 18618738 is about 4314.9435685765. The cubic root of 18618738 is about 265.0432491415.

The spelling of 18618738 in words is "eighteen million, six hundred eighteen thousand, seven hundred thirty-eight".