18139527 has 24 divisors (see below), whose sum is σ = 31707936. Its totient is φ = 9755136.

The previous prime is 18139523. The next prime is 18139531. The reversal of 18139527 is 72593181.

It is an interprime number because it is at equal distance from previous prime (18139523) and next prime (18139531).

It is not a de Polignac number, because 18139527 - 2² = 18139523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18139491 and 18139500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18139523) 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, 7398 + ... + 9539.

It is an arithmetic number, because the mean of its divisors is an integer number (1321164).

Almost surely, 2^18139527 is an apocalyptic number.

18139527 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18139527 is a deficient number, since it is larger than the sum of its proper divisors (13568409).

18139527 is a wasteful number, since it uses less digits than its factorization.

18139527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16967 (or 16964 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 18139527 is about 4259.0523593870. The cubic root of 18139527 is about 262.7495531561.

The spelling of 18139527 in words is "eighteen million, one hundred thirty-nine thousand, five hundred twenty-seven".