249242520 has 32 divisors (see below), whose sum is σ = 747727920. Its totient is φ = 66464640.

The previous prime is 249242519. The next prime is 249242527. The reversal of 249242520 is 25242942.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249242527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1038391 + ... + 1038630.

Almost surely, 2^249242520 is an apocalyptic number.

249242520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249242520 is an abundant number, since it is smaller than the sum of its proper divisors (498485400).

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

249242520 is a wasteful number, since it uses less digits than its factorization.

249242520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077035 (or 2077031 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 249242520 is about 15787.4165080928. The cubic root of 249242520 is about 629.3236379435.

The spelling of 249242520 in words is "two hundred forty-nine million, two hundred forty-two thousand, five hundred twenty".