18764139 has 16 divisors (see below), whose sum is σ = 25915392. Its totient is φ = 12068928.

The previous prime is 18764117. The next prime is 18764167. The reversal of 18764139 is 93146781.

It is not a de Polignac number, because 18764139 - 2¹⁵ = 18731371 is a prime.

It is a super-2 number, since 2×18764139² = 704185824822642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18764097 and 18764106.

It is not an unprimeable number, because it can be changed into a prime (18764539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9382 + ... + 11204.

It is an arithmetic number, because the mean of its divisors is an integer number (1619712).

Almost surely, 2^18764139 is an apocalyptic number.

18764139 is a deficient number, since it is larger than the sum of its proper divisors (7151253).

18764139 is a wasteful number, since it uses less digits than its factorization.

18764139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946.

The product of its digits is 36288, while the sum is 39.

The square root of 18764139 is about 4331.7593423458. The cubic root of 18764139 is about 265.7314029820.

The spelling of 18764139 in words is "eighteen million, seven hundred sixty-four thousand, one hundred thirty-nine".