23479749 has 6 divisors (see below), whose sum is σ = 33915206. Its totient is φ = 15653160.

The previous prime is 23479717. The next prime is 23479769. The reversal of 23479749 is 94797432.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 5688225 = 4218^2 + 2385^2 .

It is not a de Polignac number, because 23479749 - 2⁵ = 23479717 is a prime.

It is a super-2 number, since 2×23479749² = 1102597226206002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23479769) 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, 1304422 + ... + 1304439.

Almost surely, 2^23479749 is an apocalyptic number.

It is an amenable number.

23479749 is a deficient number, since it is larger than the sum of its proper divisors (10435457).

23479749 is a wasteful number, since it uses less digits than its factorization.

23479749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608867 (or 2608864 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 23479749 is about 4845.5906760683. The cubic root of 23479749 is about 286.3504148640.

The spelling of 23479749 in words is "twenty-three million, four hundred seventy-nine thousand, seven hundred forty-nine".