249998157 has 16 divisors (see below), whose sum is σ = 374943360. Its totient is φ = 166663980.

The previous prime is 249998131. The next prime is 249998213. The reversal of 249998157 is 751899942.

It is not a de Polignac number, because 249998157 - 2⁸ = 249997901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249998057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54969 + ... + 59342.

It is an arithmetic number, because the mean of its divisors is an integer number (23433960).

Almost surely, 2^249998157 is an apocalyptic number.

249998157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

249998157 is a deficient number, since it is larger than the sum of its proper divisors (124945203).

249998157 is an frugal number, since it uses more digits than its factorization.

249998157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114332 (or 114314 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 249998157 is about 15811.3300199572. The cubic root of 249998157 is about 629.9589769206.

The spelling of 249998157 in words is "two hundred forty-nine million, nine hundred ninety-eight thousand, one hundred fifty-seven".