249569890 has 16 divisors (see below), whose sum is σ = 449919360. Its totient is φ = 99673840.

The previous prime is 249569867. The next prime is 249569891. The reversal of 249569890 is 98965942.

It is a super-2 number, since 2×249569890² = 124570259989224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (249569891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12346 + ... + 25525.

It is an arithmetic number, because the mean of its divisors is an integer number (28119960).

Almost surely, 2^249569890 is an apocalyptic number.

249569890 is a deficient number, since it is larger than the sum of its proper divisors (200349470).

249569890 is a wasteful number, since it uses less digits than its factorization.

249569890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38537.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The square root of 249569890 is about 15797.7811733167. The cubic root of 249569890 is about 629.5990478064.

The spelling of 249569890 in words is "two hundred forty-nine million, five hundred sixty-nine thousand, eight hundred ninety".