249218923 has 6 divisors (see below), whose sum is σ = 250323404. Its totient is φ = 248119284.

The previous prime is 249218911. The next prime is 249218933. The reversal of 249218923 is 329812942.

It is a de Polignac number, because none of the positive numbers 2^k-249218923 is a prime.

It is a super-2 number, since 2×249218923² = 124220143162559858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249218933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54940 + ... + 59302.

Almost surely, 2^249218923 is an apocalyptic number.

249218923 is a deficient number, since it is larger than the sum of its proper divisors (1104481).

249218923 is an frugal number, since it uses more digits than its factorization.

249218923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841 (or 4602 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 249218923 is about 15786.6691547014. The cubic root of 249218923 is about 629.3037769416.

The spelling of 249218923 in words is "two hundred forty-nine million, two hundred eighteen thousand, nine hundred twenty-three".