249717825 has 36 divisors (see below), whose sum is σ = 511171648. Its totient is φ = 114156000.

The previous prime is 249717799. The next prime is 249717827. The reversal of 249717825 is 528717942.

It is a happy number.

It is not a de Polignac number, because 249717825 - 2⁷ = 249717697 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249717827) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 77701 + ... + 80850.

Almost surely, 2^249717825 is an apocalyptic number.

249717825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

249717825 is an abundant number, since it is smaller than the sum of its proper divisors (261453823).

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

249717825 is a wasteful number, since it uses less digits than its factorization.

249717825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158574 (or 158566 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 249717825 is about 15802.4626245405. The cubic root of 249717825 is about 629.7234235714.

The spelling of 249717825 in words is "two hundred forty-nine million, seven hundred seventeen thousand, eight hundred twenty-five".