18490797 has 18 divisors (see below), whose sum is σ = 28923882. Its totient is φ = 11378016.

The previous prime is 18490789. The next prime is 18490807. The reversal of 18490797 is 79709481.

It can be written as a sum of positive squares in 3 ways, for example, as 1425636 + 17065161 = 1194^2 + 4131^2 .

It is not a de Polignac number, because 18490797 - 2³ = 18490789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18490757) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4558 + ... + 7599.

Almost surely, 2^18490797 is an apocalyptic number.

It is an amenable number.

18490797 is a deficient number, since it is larger than the sum of its proper divisors (10433085).

18490797 is a wasteful number, since it uses less digits than its factorization.

18490797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12189 (or 12173 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 18490797 is about 4300.0926734200. The cubic root of 18490797 is about 264.4347605628.

The spelling of 18490797 in words is "eighteen million, four hundred ninety thousand, seven hundred ninety-seven".