23942440 has 32 divisors (see below), whose sum is σ = 54357480. Its totient is φ = 9490432.

The previous prime is 23942437. The next prime is 23942449. The reversal of 23942440 is 4424932.

It can be written as a sum of positive squares in 4 ways, for example, as 15888196 + 8054244 = 3986^2 + 2838^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23942399 and 23942408.

It is not an unprimeable number, because it can be changed into a prime (23942449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1872 + ... + 7168.

Almost surely, 2^23942440 is an apocalyptic number.

23942440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23942440 is an abundant number, since it is smaller than the sum of its proper divisors (30415040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23942440 is a wasteful number, since it uses less digits than its factorization.

23942440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5421 (or 5417 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 23942440 is about 4893.1012660684. The cubic root of 23942440 is about 288.2191297825.

The spelling of 23942440 in words is "twenty-three million, nine hundred forty-two thousand, four hundred forty".