249398939 has 4 divisors (see below), whose sum is σ = 250652400. Its totient is φ = 248145480.

The previous prime is 249398911. The next prime is 249398951. The reversal of 249398939 is 939893942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249398939 - 2¹² = 249394843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249391939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626432 + ... + 626829.

It is an arithmetic number, because the mean of its divisors is an integer number (62663100).

Almost surely, 2^249398939 is an apocalyptic number.

249398939 is a deficient number, since it is larger than the sum of its proper divisors (1253461).

249398939 is a wasteful number, since it uses less digits than its factorization.

249398939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253460.

The product of its digits is 3779136, while the sum is 56.

The square root of 249398939 is about 15792.3696448633. The cubic root of 249398939 is about 629.4552602001.

The spelling of 249398939 in words is "two hundred forty-nine million, three hundred ninety-eight thousand, nine hundred thirty-nine".