23678021 has 4 divisors (see below), whose sum is σ = 23798412. Its totient is φ = 23557632.

The previous prime is 23677999. The next prime is 23678023. The reversal of 23678021 is 12087632.

It is a happy number.

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 14737921 + 8940100 = 3839^2 + 2990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23678021 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 (23678023) 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, 59900 + ... + 60293.

It is an arithmetic number, because the mean of its divisors is an integer number (5949603).

Almost surely, 2^23678021 is an apocalyptic number.

It is an amenable number.

23678021 is a deficient number, since it is larger than the sum of its proper divisors (120391).

23678021 is a wasteful number, since it uses less digits than its factorization.

23678021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120390.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 23678021 is about 4866.0066789925. The cubic root of 23678021 is about 287.1541742267.

The spelling of 23678021 in words is "twenty-three million, six hundred seventy-eight thousand, twenty-one".