23421493 has 4 divisors (see below), whose sum is σ = 23477548. Its totient is φ = 23365440.

The previous prime is 23421469. The next prime is 23421511. The reversal of 23421493 is 39412432.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 925444 + 22496049 = 962^2 + 4743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23421493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421413) 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, 27396 + ... + 28237.

It is an arithmetic number, because the mean of its divisors is an integer number (5869387).

Almost surely, 2^23421493 is an apocalyptic number.

It is an amenable number.

23421493 is a deficient number, since it is larger than the sum of its proper divisors (56055).

23421493 is an equidigital number, since it uses as much as digits as its factorization.

23421493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56054.

The product of its digits is 5184, while the sum is 28.

The square root of 23421493 is about 4839.5757045427. The cubic root of 23421493 is about 286.1133957889.

The spelling of 23421493 in words is "twenty-three million, four hundred twenty-one thousand, four hundred ninety-three".