249679689 has 16 divisors (see below), whose sum is σ = 380983680. Its totient is φ = 142479360.

The previous prime is 249679679. The next prime is 249679691. The reversal of 249679689 is 986976942.

It is not a de Polignac number, because 249679689 - 2¹¹ = 249677641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249679609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8419 + ... + 23879.

It is an arithmetic number, because the mean of its divisors is an integer number (23811480).

Almost surely, 2^249679689 is an apocalyptic number.

It is an amenable number.

249679689 is a deficient number, since it is larger than the sum of its proper divisors (131303991).

249679689 is a wasteful number, since it uses less digits than its factorization.

249679689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16240.

The product of its digits is 11757312, while the sum is 60.

The square root of 249679689 is about 15801.2559310961. The cubic root of 249679689 is about 629.6913655808.

The spelling of 249679689 in words is "two hundred forty-nine million, six hundred seventy-nine thousand, six hundred eighty-nine".