249872987 has 16 divisors (see below), whose sum is σ = 325628352. Its totient is φ = 186071040.

The previous prime is 249872977. The next prime is 249872993. The reversal of 249872987 is 789278942.

It is a cyclic number.

It is not a de Polignac number, because 249872987 - 2⁶ = 249872923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249872977) 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, 79214 + ... + 82307.

It is an arithmetic number, because the mean of its divisors is an integer number (20351772).

Almost surely, 2^249872987 is an apocalyptic number.

249872987 is a deficient number, since it is larger than the sum of its proper divisors (75755365).

249872987 is a wasteful number, since it uses less digits than its factorization.

249872987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161558.

The product of its digits is 4064256, while the sum is 56.

The square root of 249872987 is about 15807.3712868396. The cubic root of 249872987 is about 629.8538226404.

The spelling of 249872987 in words is "two hundred forty-nine million, eight hundred seventy-two thousand, nine hundred eighty-seven".