18899539 has 2 divisors, whose sum is σ = 18899540. Its totient is φ = 18899538.

The previous prime is 18899533. The next prime is 18899549. The reversal of 18899539 is 93599881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18899539 - 2¹⁹ = 18375251 is a prime.

It is not a weakly prime, because it can be changed into another prime (18899533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449769 + 9449770.

It is an arithmetic number, because the mean of its divisors is an integer number (9449770).

Almost surely, 2^18899539 is an apocalyptic number.

18899539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18899539 is an equidigital number, since it uses as much as digits as its factorization.

18899539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 52.

The square root of 18899539 is about 4347.3600034964. The cubic root of 18899539 is about 266.3690347711.

The spelling of 18899539 in words is "eighteen million, eight hundred ninety-nine thousand, five hundred thirty-nine".