23523440 has 20 divisors (see below), whose sum is σ = 54692184. Its totient is φ = 9409344.

The previous prime is 23523439. The next prime is 23523473. The reversal of 23523440 is 4432532.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146942 + ... + 147101.

Almost surely, 2^23523440 is an apocalyptic number.

23523440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23523440 is an abundant number, since it is smaller than the sum of its proper divisors (31168744).

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

23523440 is a wasteful number, since it uses less digits than its factorization.

23523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294056 (or 294050 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 23523440 is about 4850.0969062484. The cubic root of 23523440 is about 286.5279179525.

Adding to 23523440 its reverse (4432532), we get a palindrome (27955972).

The spelling of 23523440 in words is "twenty-three million, five hundred twenty-three thousand, four hundred forty".