18499739 has 2 divisors, whose sum is σ = 18499740. Its totient is φ = 18499738.

The previous prime is 18499729. The next prime is 18499769. The reversal of 18499739 is 93799481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18499739 - 2¹⁶ = 18434203 is a prime.

It is not a weakly prime, because it can be changed into another prime (18499729) 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 as a sum of consecutive naturals, namely, 9249869 + 9249870.

It is an arithmetic number, because the mean of its divisors is an integer number (9249870).

Almost surely, 2^18499739 is an apocalyptic number.

18499739 is a deficient number, since it is larger than the sum of its proper divisors (1).

18499739 is an equidigital number, since it uses as much as digits as its factorization.

18499739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 18499739 is about 4301.1322927806. The cubic root of 18499739 is about 264.4773798645.

The spelling of 18499739 in words is "eighteen million, four hundred ninety-nine thousand, seven hundred thirty-nine".