249999980 has 12 divisors (see below), whose sum is σ = 525000000. Its totient is φ = 99999984.

The previous prime is 249999941. The next prime is 249999991. The reversal of 249999980 is 89999942.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

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, 6249980 + ... + 6250019.

It is an arithmetic number, because the mean of its divisors is an integer number (43750000).

Almost surely, 2^249999980 is an apocalyptic number.

249999980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249999980 is an abundant number, since it is smaller than the sum of its proper divisors (275000020).

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

249999980 is a wasteful number, since it uses less digits than its factorization.

249999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500008 (or 12500006 counting only the distinct ones).

The product of its (nonzero) digits is 3779136, while the sum is 59.

The square root of 249999980 is about 15811.3876683864. The cubic root of 249999980 is about 629.9605081485.

The spelling of 249999980 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred eighty".