249722139 has 32 divisors (see below), whose sum is σ = 352659456. Its totient is φ = 156988800.

The previous prime is 249722117. The next prime is 249722153. The reversal of 249722139 is 931227942.

It is not a de Polignac number, because 249722139 - 2⁵ = 249722107 is a prime.

It is a super-2 number, since 2×249722139² = 124722293413470642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 249722097 and 249722106.

It is not an unprimeable number, because it can be changed into a prime (249722189) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 787609 + ... + 787925.

It is an arithmetic number, because the mean of its divisors is an integer number (11020608).

Almost surely, 2^249722139 is an apocalyptic number.

249722139 is a deficient number, since it is larger than the sum of its proper divisors (102937317).

249722139 is a wasteful number, since it uses less digits than its factorization.

249722139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555.

The product of its digits is 54432, while the sum is 39.

The square root of 249722139 is about 15802.5991216635. The cubic root of 249722139 is about 629.7270498127.

The spelling of 249722139 in words is "two hundred forty-nine million, seven hundred twenty-two thousand, one hundred thirty-nine".