249987725 has 24 divisors (see below), whose sum is σ = 342868680. Its totient is φ = 179608320.

The previous prime is 249987677. The next prime is 249987733. The reversal of 249987725 is 527789942.

249987725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 12 ways, for example, as 19616041 + 230371684 = 4429^2 + 15178^2 .

It is a de Polignac number, because none of the positive numbers 2^k-249987725 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1631 + ... + 22419.

It is an arithmetic number, because the mean of its divisors is an integer number (14286195).

Almost surely, 2^249987725 is an apocalyptic number.

249987725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

249987725 is a deficient number, since it is larger than the sum of its proper divisors (92880955).

249987725 is a wasteful number, since it uses less digits than its factorization.

249987725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20849 (or 20844 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 53.

The square root of 249987725 is about 15811.0001264942. Note that the first 3 decimals coincide. The cubic root of 249987725 is about 629.9502144248.

It can be divided in two parts, 24998 and 7725, that added together give a palindrome (32723).

The spelling of 249987725 in words is "two hundred forty-nine million, nine hundred eighty-seven thousand, seven hundred twenty-five".