18439049 has 4 divisors (see below), whose sum is σ = 18552336. Its totient is φ = 18325764.

The previous prime is 18439039. The next prime is 18439051. The reversal of 18439049 is 94093481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18439049 - 2⁸ = 18438793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18439009) 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, 56399 + ... + 56724.

It is an arithmetic number, because the mean of its divisors is an integer number (4638084).

Almost surely, 2^18439049 is an apocalyptic number.

It is an amenable number.

18439049 is a deficient number, since it is larger than the sum of its proper divisors (113287).

18439049 is a wasteful number, since it uses less digits than its factorization.

18439049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113286.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18439049 is about 4294.0713780747. The cubic root of 18439049 is about 264.1878493542.

The spelling of 18439049 in words is "eighteen million, four hundred thirty-nine thousand, forty-nine".