18640995 has 16 divisors (see below), whose sum is σ = 31395840. Its totient is φ = 9418464.

The previous prime is 18640987. The next prime is 18641011. The reversal of 18640995 is 59904681.

It is not a de Polignac number, because 18640995 - 2³ = 18640987 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32419 + ... + 32988.

It is an arithmetic number, because the mean of its divisors is an integer number (1962240).

Almost surely, 2^18640995 is an apocalyptic number.

18640995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18640995 is a deficient number, since it is larger than the sum of its proper divisors (12754845).

18640995 is a wasteful number, since it uses less digits than its factorization.

18640995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65434.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 18640995 is about 4317.5218586592. The cubic root of 18640995 is about 265.1488187484.

The spelling of 18640995 in words is "eighteen million, six hundred forty thousand, nine hundred ninety-five".