18459949 has 2 divisors, whose sum is σ = 18459950. Its totient is φ = 18459948.

The previous prime is 18459941. The next prime is 18459967. The reversal of 18459949 is 94995481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 777924 = 4205^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 18459949 - 2³ = 18459941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18459941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9229974 + 9229975.

It is an arithmetic number, because the mean of its divisors is an integer number (9229975).

Almost surely, 2^18459949 is an apocalyptic number.

It is an amenable number.

18459949 is a deficient number, since it is larger than the sum of its proper divisors (1).

18459949 is an equidigital number, since it uses as much as digits as its factorization.

18459949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 49.

The square root of 18459949 is about 4296.5042767348. The cubic root of 18459949 is about 264.2876274793.

The spelling of 18459949 in words is "eighteen million, four hundred fifty-nine thousand, nine hundred forty-nine".