18139495 has 16 divisors (see below), whose sum is σ = 24514560. Its totient is φ = 12765600.

The previous prime is 18139487. The next prime is 18139501. The reversal of 18139495 is 59493181.

It is not a de Polignac number, because 18139495 - 2³ = 18139487 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3615 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^18139495 is an apocalyptic number.

18139495 is a deficient number, since it is larger than the sum of its proper divisors (6375065).

18139495 is a wasteful number, since it uses less digits than its factorization.

18139495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10686.

The product of its digits is 38880, while the sum is 40.

The square root of 18139495 is about 4259.0486026811. The cubic root of 18139495 is about 262.7493986503.

The spelling of 18139495 in words is "eighteen million, one hundred thirty-nine thousand, four hundred ninety-five".