18790865 has 8 divisors (see below), whose sum is σ = 23875560. Its totient is φ = 14148352.

The previous prime is 18790853. The next prime is 18790873. The reversal of 18790865 is 56809781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10316944 + 8473921 = 3212^2 + 2911^2 .

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

It is not a de Polignac number, because 18790865 - 2¹⁸ = 18528721 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110450 + ... + 110619.

It is an arithmetic number, because the mean of its divisors is an integer number (2984445).

Almost surely, 2^18790865 is an apocalyptic number.

It is an amenable number.

18790865 is a deficient number, since it is larger than the sum of its proper divisors (5084695).

18790865 is a wasteful number, since it uses less digits than its factorization.

18790865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221091.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18790865 is about 4334.8431344167. The cubic root of 18790865 is about 265.8575046619.

The spelling of 18790865 in words is "eighteen million, seven hundred ninety thousand, eight hundred sixty-five".