249436645 has 16 divisors (see below), whose sum is σ = 306783360. Its totient is φ = 194635584.

The previous prime is 249436639. The next prime is 249436657. The reversal of 249436645 is 546634942.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 249436645 - 2³ = 249436637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30891 + ... + 38119.

It is an arithmetic number, because the mean of its divisors is an integer number (19173960).

Almost surely, 2^249436645 is an apocalyptic number.

It is an amenable number.

249436645 is a deficient number, since it is larger than the sum of its proper divisors (57346715).

249436645 is a wasteful number, since it uses less digits than its factorization.

249436645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7404.

The product of its digits is 622080, while the sum is 43.

The square root of 249436645 is about 15793.5634041213. The cubic root of 249436645 is about 629.4869805222.

The spelling of 249436645 in words is "two hundred forty-nine million, four hundred thirty-six thousand, six hundred forty-five".