249577923 has 18 divisors (see below), whose sum is σ = 387397764. Its totient is φ = 142506504.

The previous prime is 249577919. The next prime is 249577949. The reversal of 249577923 is 329775942.

It is not a de Polignac number, because 249577923 - 2² = 249577919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249577903) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 190890 + ... + 192192.

It is an arithmetic number, because the mean of its divisors is an integer number (21522098).

Almost surely, 2^249577923 is an apocalyptic number.

249577923 is a deficient number, since it is larger than the sum of its proper divisors (137819841).

249577923 is an frugal number, since it uses more digits than its factorization.

249577923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 1313 counting only the distinct ones).

The product of its digits is 952560, while the sum is 48.

The square root of 249577923 is about 15798.0354158357. The cubic root of 249577923 is about 629.6058027811.

Multiplying 249577923 by its sum of digits (48), we get a square (11979740304 = 109452²).

The spelling of 249577923 in words is "two hundred forty-nine million, five hundred seventy-seven thousand, nine hundred twenty-three".