23423440 has 20 divisors (see below), whose sum is σ = 54459684. Its totient is φ = 9369344.

The previous prime is 23423429. The next prime is 23423441. The reversal of 23423440 is 4432432.

It can be written as a sum of positive squares in 2 ways, for example, as 2702736 + 20720704 = 1644^2 + 4552^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23423441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146317 + ... + 146476.

Almost surely, 2^23423440 is an apocalyptic number.

23423440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23423440 is an abundant number, since it is smaller than the sum of its proper divisors (31036244).

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

23423440 is a wasteful number, since it uses less digits than its factorization.

23423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292806 (or 292800 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

The square root of 23423440 is about 4839.7768543601. The cubic root of 23423440 is about 286.1213236546.

Adding to 23423440 its reverse (4432432), we get a palindrome (27855872).

The spelling of 23423440 in words is "twenty-three million, four hundred twenty-three thousand, four hundred forty".