249359640 has 32 divisors (see below), whose sum is σ = 748079280. Its totient is φ = 66495872.

The previous prime is 249359633. The next prime is 249359651. The reversal of 249359640 is 46953942.

It is a junction number, because it is equal to n+sod(n) for n = 249359592 and 249359601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038879 + ... + 1039118.

Almost surely, 2^249359640 is an apocalyptic number.

249359640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249359640 is an abundant number, since it is smaller than the sum of its proper divisors (498719640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249359640 is a wasteful number, since it uses less digits than its factorization.

249359640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078011 (or 2078007 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 249359640 is about 15791.1253557180. The cubic root of 249359640 is about 629.4221963577.

The spelling of 249359640 in words is "two hundred forty-nine million, three hundred fifty-nine thousand, six hundred forty".