813942023 has 4 divisors (see below), whose sum is σ = 814074648. Its totient is φ = 813809400.

The previous prime is 813942001. The next prime is 813942053. The reversal of 813942023 is 320249318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 813942023 - 2⁸ = 813941767 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 (813942053) 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, 56636 + ... + 69537.

It is an arithmetic number, because the mean of its divisors is an integer number (203518662).

Almost surely, 2^813942023 is an apocalyptic number.

813942023 is a deficient number, since it is larger than the sum of its proper divisors (132625).

813942023 is a wasteful number, since it uses less digits than its factorization.

813942023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132624.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 813942023 is about 28529.6691708824. The cubic root of 813942023 is about 933.6795005754.

The spelling of 813942023 in words is "eight hundred thirteen million, nine hundred forty-two thousand, twenty-three".