249931540 has 24 divisors (see below), whose sum is σ = 527177952. Its totient is φ = 99530400.

The previous prime is 249931519. The next prime is 249931601. The reversal of 249931540 is 45139942.

It is a self number, because there is not a number n which added to its sum of digits gives 249931540.

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, 22986 + ... + 32065.

It is an arithmetic number, because the mean of its divisors is an integer number (21965748).

Almost surely, 2^249931540 is an apocalyptic number.

249931540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249931540 is an abundant number, since it is smaller than the sum of its proper divisors (277246412).

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

249931540 is a wasteful number, since it uses less digits than its factorization.

249931540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55287 (or 55285 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 249931540 is about 15809.2232573267. The cubic root of 249931540 is about 629.9030169011.

The spelling of 249931540 in words is "two hundred forty-nine million, nine hundred thirty-one thousand, five hundred forty".