18997699 has 8 divisors (see below), whose sum is σ = 22412288. Its totient is φ = 15758280.

The previous prime is 18997679. The next prime is 18997703. The reversal of 18997699 is 99679981.

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

It is a cyclic number.

It is not a de Polignac number, because 18997699 - 2⁷ = 18997571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18997669) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43557 + ... + 43990.

It is an arithmetic number, because the mean of its divisors is an integer number (2801536).

Almost surely, 2^18997699 is an apocalyptic number.

18997699 is a deficient number, since it is larger than the sum of its proper divisors (3414589).

18997699 is an equidigital number, since it uses as much as digits as its factorization.

18997699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87585.

The product of its digits is 2204496, while the sum is 58.

The square root of 18997699 is about 4358.6349927472. The cubic root of 18997699 is about 266.8293925212.

The spelling of 18997699 in words is "eighteen million, nine hundred ninety-seven thousand, six hundred ninety-nine".