249918820 has 12 divisors (see below), whose sum is σ = 524829564. Its totient is φ = 99967520.

The previous prime is 249918811. The next prime is 249918841. The reversal of 249918820 is 28819942.

It can be written as a sum of positive squares in 2 ways, for example, as 35354916 + 214563904 = 5946^2 + 14648^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6247951 + ... + 6247990.

It is an arithmetic number, because the mean of its divisors is an integer number (43735797).

Almost surely, 2^249918820 is an apocalyptic number.

249918820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249918820 is an abundant number, since it is smaller than the sum of its proper divisors (274910744).

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

249918820 is a wasteful number, since it uses less digits than its factorization.

249918820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12495950 (or 12495948 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 249918820 is about 15808.8209554033. The cubic root of 249918820 is about 629.8923306383.

The spelling of 249918820 in words is "two hundred forty-nine million, nine hundred eighteen thousand, eight hundred twenty".