18957799 has 4 divisors (see below), whose sum is σ = 21666064. Its totient is φ = 16249536.

The previous prime is 18957791. The next prime is 18957803. The reversal of 18957799 is 99775981.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18957799 - 2³ = 18957791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18957791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1354122 + ... + 1354135.

It is an arithmetic number, because the mean of its divisors is an integer number (5416516).

Almost surely, 2^18957799 is an apocalyptic number.

18957799 is a deficient number, since it is larger than the sum of its proper divisors (2708265).

18957799 is an equidigital number, since it uses as much as digits as its factorization.

18957799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708264.

The product of its digits is 1428840, while the sum is 55.

The square root of 18957799 is about 4354.0554658847. The cubic root of 18957799 is about 266.6424583927.

The spelling of 18957799 in words is "eighteen million, nine hundred fifty-seven thousand, seven hundred ninety-nine".