249427687 has 4 divisors (see below), whose sum is σ = 262555480. Its totient is φ = 236299896.

The previous prime is 249427669. The next prime is 249427691. The reversal of 249427687 is 786724942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249427687 - 2¹⁵ = 249394919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 249427687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249421687) 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, 6563868 + ... + 6563905.

It is an arithmetic number, because the mean of its divisors is an integer number (65638870).

Almost surely, 2^249427687 is an apocalyptic number.

249427687 is a deficient number, since it is larger than the sum of its proper divisors (13127793).

249427687 is a wasteful number, since it uses less digits than its factorization.

249427687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13127792.

The product of its digits is 1354752, while the sum is 49.

The square root of 249427687 is about 15793.2798050310. The cubic root of 249427687 is about 629.4794448587.

The spelling of 249427687 in words is "two hundred forty-nine million, four hundred twenty-seven thousand, six hundred eighty-seven".