23421487 has 4 divisors (see below), whose sum is σ = 23431176. Its totient is φ = 23411800.

The previous prime is 23421469. The next prime is 23421511. The reversal of 23421487 is 78412432.

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 a de Polignac number, because none of the positive numbers 2^k-23421487 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2112 + ... + 7162.

It is an arithmetic number, because the mean of its divisors is an integer number (5857794).

Almost surely, 2^23421487 is an apocalyptic number.

23421487 is a deficient number, since it is larger than the sum of its proper divisors (9689).

23421487 is an equidigital number, since it uses as much as digits as its factorization.

23421487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9688.

The product of its digits is 10752, while the sum is 31.

The square root of 23421487 is about 4839.5750846536. The cubic root of 23421487 is about 286.1133713573.

The spelling of 23421487 in words is "twenty-three million, four hundred twenty-one thousand, four hundred eighty-seven".