249389864 has 16 divisors (see below), whose sum is σ = 495112500. Its totient is φ = 117359872.

The previous prime is 249389831. The next prime is 249389869. The reversal of 249389864 is 468983942.

It can be written as a sum of positive squares in 2 ways, for example, as 229764964 + 19624900 = 15158^2 + 4430^2 .

It is not an unprimeable number, because it can be changed into a prime (249389869) 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, 916739 + ... + 917010.

Almost surely, 2^249389864 is an apocalyptic number.

It is an amenable number.

249389864 is a deficient number, since it is larger than the sum of its proper divisors (245722636).

249389864 is a wasteful number, since it uses less digits than its factorization.

249389864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833772 (or 1833768 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 53.

The square root of 249389864 is about 15792.0823199476. The cubic root of 249389864 is about 629.4476253431.

The spelling of 249389864 in words is "two hundred forty-nine million, three hundred eighty-nine thousand, eight hundred sixty-four".