18790739 has 6 divisors (see below), whose sum is σ = 20514684. Its totient is φ = 17069420.

The previous prime is 18790727. The next prime is 18790757. The reversal of 18790739 is 93709781.

It is not a de Polignac number, because 18790739 - 2⁸ = 18790483 is a prime.

It is a super-2 number, since 2×18790739² = 706183744332242, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18790739.

It is not an unprimeable number, because it can be changed into a prime (18790799) 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, 13724 + ... + 15030.

It is an arithmetic number, because the mean of its divisors is an integer number (3419114).

Almost surely, 2^18790739 is an apocalyptic number.

18790739 is a deficient number, since it is larger than the sum of its proper divisors (1723945).

18790739 is an frugal number, since it uses more digits than its factorization.

18790739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625 (or 1318 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 18790739 is about 4334.8286009945. The cubic root of 18790739 is about 265.8569104348.

Multiplying 18790739 by its sum of digits (44), we get a square (826792516 = 28754²).

The spelling of 18790739 in words is "eighteen million, seven hundred ninety thousand, seven hundred thirty-nine".