249639645 has 24 divisors (see below), whose sum is σ = 424308384. Its totient is φ = 125307136.

The previous prime is 249639641. The next prime is 249639653. The reversal of 249639645 is 546936942.

It is not a de Polignac number, because 249639645 - 2² = 249639641 is a prime.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 249639594 and 249639603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249639641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24459 + ... + 33128.

It is an arithmetic number, because the mean of its divisors is an integer number (17679516).

Almost surely, 2^249639645 is an apocalyptic number.

It is an amenable number.

249639645 is a deficient number, since it is larger than the sum of its proper divisors (174668739).

249639645 is a wasteful number, since it uses less digits than its factorization.

249639645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57629 (or 57612 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 48.

The square root of 249639645 is about 15799.9887658188. The cubic root of 249639645 is about 629.6577001683.

The spelling of 249639645 in words is "two hundred forty-nine million, six hundred thirty-nine thousand, six hundred forty-five".