18620999 has 2 divisors, whose sum is σ = 18621000. Its totient is φ = 18620998.

The previous prime is 18620989. The next prime is 18621013. The reversal of 18620999 is 99902681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18620999 - 2⁴ = 18620983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18620989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310499 + 9310500.

It is an arithmetic number, because the mean of its divisors is an integer number (9310500).

Almost surely, 2^18620999 is an apocalyptic number.

18620999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620999 is an equidigital number, since it uses as much as digits as its factorization.

18620999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 18620999 is about 4315.2055570969. The cubic root of 18620999 is about 265.0539773754.

The spelling of 18620999 in words is "eighteen million, six hundred twenty thousand, nine hundred ninety-nine".