249992640 has 168 divisors, whose sum is σ = 874580928. Its totient is φ = 65525760.

The previous prime is 249992627. The next prime is 249992641. The reversal of 249992640 is 46299942.

It is a happy number.

249992640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249992641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174969 + ... + 176391.

Almost surely, 2^249992640 is an apocalyptic number.

249992640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249992640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (437290464).

249992640 is an abundant number, since it is smaller than the sum of its proper divisors (624588288).

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

249992640 is a wasteful number, since it uses less digits than its factorization.

249992640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1494 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 249992640 is about 15811.1555554931. The cubic root of 249992640 is about 629.9543428742.

The spelling of 249992640 in words is "two hundred forty-nine million, nine hundred ninety-two thousand, six hundred forty".