18639670 has 16 divisors (see below), whose sum is σ = 38344608. Its totient is φ = 6390720.

The previous prime is 18639653. The next prime is 18639679. The reversal of 18639670 is 7693681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133071 + ... + 133210.

It is an arithmetic number, because the mean of its divisors is an integer number (2396538).

Almost surely, 2^18639670 is an apocalyptic number.

18639670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18639670 is an abundant number, since it is smaller than the sum of its proper divisors (19704938).

18639670 is a wasteful number, since it uses less digits than its factorization.

18639670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266295.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 18639670 is about 4317.3684114284. The cubic root of 18639670 is about 265.1425363493.

The spelling of 18639670 in words is "eighteen million, six hundred thirty-nine thousand, six hundred seventy".