249650639 has 12 divisors (see below), whose sum is σ = 290676744. Its totient is φ = 213789744.

The previous prime is 249650629. The next prime is 249650641. The reversal of 249650639 is 936056942.

It is not a de Polignac number, because 249650639 - 2²⁰ = 248602063 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 249650639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249650629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82949 + ... + 85905.

It is an arithmetic number, because the mean of its divisors is an integer number (24223062).

Almost surely, 2^249650639 is an apocalyptic number.

249650639 is a deficient number, since it is larger than the sum of its proper divisors (41026105).

249650639 is a wasteful number, since it uses less digits than its factorization.

249650639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4694 (or 4687 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 249650639 is about 15800.3366736282. The cubic root of 249650639 is about 629.6669432984. Note that the first 3 decimals are identical.

It can be divided in two parts, 2496 and 50639, that added together give a palindrome (53135).

The spelling of 249650639 in words is "two hundred forty-nine million, six hundred fifty thousand, six hundred thirty-nine".