249639340 has 24 divisors (see below), whose sum is σ = 524543040. Its totient is φ = 99798528.

The previous prime is 249639317. The next prime is 249639353. The reversal of 249639340 is 43936942.

249639340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 249639293 and 249639302.

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, 58396 + ... + 62524.

It is an arithmetic number, because the mean of its divisors is an integer number (21855960).

Almost surely, 2^249639340 is an apocalyptic number.

249639340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249639340 is an abundant number, since it is smaller than the sum of its proper divisors (274903700).

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

249639340 is a wasteful number, since it uses less digits than its factorization.

249639340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7161 (or 7159 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 249639340 is about 15799.9791139102. The cubic root of 249639340 is about 629.6574437377.

The spelling of 249639340 in words is "two hundred forty-nine million, six hundred thirty-nine thousand, three hundred forty".