23147440 has 20 divisors (see below), whose sum is σ = 53817984. Its totient is φ = 9258944.

The previous prime is 23147437. The next prime is 23147441. The reversal of 23147440 is 4474132.

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

It is not an unprimeable number, because it can be changed into a prime (23147441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144592 + ... + 144751.

Almost surely, 2^23147440 is an apocalyptic number.

23147440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23147440 is an abundant number, since it is smaller than the sum of its proper divisors (30670544).

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

23147440 is a wasteful number, since it uses less digits than its factorization.

23147440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289356 (or 289350 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 23147440 is about 4811.1786497697. The cubic root of 23147440 is about 284.9930848840.

The spelling of 23147440 in words is "twenty-three million, one hundred forty-seven thousand, four hundred forty".