18139797 has 24 divisors (see below), whose sum is σ = 28383264. Its totient is φ = 11097504.

The previous prime is 18139789. The next prime is 18139811. The reversal of 18139797 is 79793181.

It is not a de Polignac number, because 18139797 - 2³ = 18139789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139757) 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 23 ways as a sum of consecutive naturals, for example, 26218 + ... + 26900.

It is an arithmetic number, because the mean of its divisors is an integer number (1182636).

Almost surely, 2^18139797 is an apocalyptic number.

It is an amenable number.

18139797 is a deficient number, since it is larger than the sum of its proper divisors (10243467).

18139797 is a wasteful number, since it uses less digits than its factorization.

18139797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 926 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 18139797 is about 4259.0840564610. The cubic root of 18139797 is about 262.7508567923.

The spelling of 18139797 in words is "eighteen million, one hundred thirty-nine thousand, seven hundred ninety-seven".