23440387 has 4 divisors (see below), whose sum is σ = 23450616. Its totient is φ = 23430160.

The previous prime is 23440369. The next prime is 23440393. The reversal of 23440387 is 78304432.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23440387 - 2¹¹ = 23438339 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (23440987) 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, 87 + ... + 6847.

It is an arithmetic number, because the mean of its divisors is an integer number (5862654).

Almost surely, 2^23440387 is an apocalyptic number.

23440387 is a deficient number, since it is larger than the sum of its proper divisors (10229).

23440387 is an equidigital number, since it uses as much as digits as its factorization.

23440387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10228.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 23440387 is about 4841.5273416557. The cubic root of 23440387 is about 286.1903105204.

The spelling of 23440387 in words is "twenty-three million, four hundred forty thousand, three hundred eighty-seven".