18070639 has 6 divisors (see below), whose sum is σ = 18326976. Its totient is φ = 17817840.

The previous prime is 18070631. The next prime is 18070667. The reversal of 18070639 is 93607081.

It is not a de Polignac number, because 18070639 - 2³ = 18070631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18070631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3634 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (3054496).

Almost surely, 2^18070639 is an apocalyptic number.

18070639 is a deficient number, since it is larger than the sum of its proper divisors (256337).

18070639 is an frugal number, since it uses more digits than its factorization.

18070639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 18070639 is about 4250.9574215699. The cubic root of 18070639 is about 262.4165188809.

The spelling of 18070639 in words is "eighteen million, seventy thousand, six hundred thirty-nine".