249138923 has 12 divisors (see below), whose sum is σ = 273673608. Its totient is φ = 224927040.

The previous prime is 249138899. The next prime is 249138931. The reversal of 249138923 is 329831942.

It is not a de Polignac number, because 249138923 - 2⁸ = 249138667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249138943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 795815 + ... + 796127.

It is an arithmetic number, because the mean of its divisors is an integer number (22806134).

Almost surely, 2^249138923 is an apocalyptic number.

249138923 is a deficient number, since it is larger than the sum of its proper divisors (24534685).

249138923 is an equidigital number, since it uses as much as digits as its factorization.

249138923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 593 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 249138923 is about 15784.1351679463. The cubic root of 249138923 is about 629.2364336203.

It can be divided in two parts, 2491 and 38923, that added together give a palindrome (41414).

The spelling of 249138923 in words is "two hundred forty-nine million, one hundred thirty-eight thousand, nine hundred twenty-three".