249909489 has 32 divisors (see below), whose sum is σ = 390848000. Its totient is φ = 157382352.

The previous prime is 249909479. The next prime is 249909493. The reversal of 249909489 is 984909942.

It is not a de Polignac number, because 249909489 - 2²⁵ = 216355057 is a prime.

It is a super-2 number, since 2×249909489² = 124909505384482242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249909409) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 317154 + ... + 317940.

It is an arithmetic number, because the mean of its divisors is an integer number (12214000).

Almost surely, 2^249909489 is an apocalyptic number.

It is an amenable number.

249909489 is a deficient number, since it is larger than the sum of its proper divisors (140938511).

249909489 is a wasteful number, since it uses less digits than its factorization.

249909489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434 (or 1428 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 249909489 is about 15808.5258326006. The cubic root of 249909489 is about 629.8844912948.

The spelling of 249909489 in words is "two hundred forty-nine million, nine hundred nine thousand, four hundred eighty-nine".