18139507 has 8 divisors (see below), whose sum is σ = 19015920. Its totient is φ = 17283840.

The previous prime is 18139501. The next prime is 18139523. The reversal of 18139507 is 70593181.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18139507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18139501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3382 + ... + 6907.

It is an arithmetic number, because the mean of its divisors is an integer number (2376990).

Almost surely, 2^18139507 is an apocalyptic number.

18139507 is a deficient number, since it is larger than the sum of its proper divisors (876413).

18139507 is a wasteful number, since it uses less digits than its factorization.

18139507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10373.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18139507 is about 4259.0500114462. The cubic root of 18139507 is about 262.7494565900.

The spelling of 18139507 in words is "eighteen million, one hundred thirty-nine thousand, five hundred seven".