813402943 has 2 divisors, whose sum is σ = 813402944. Its totient is φ = 813402942.

The previous prime is 813402937. The next prime is 813402983. The reversal of 813402943 is 349204318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 813402943 - 2⁵ = 813402911 is a prime.

It is a super-2 number, since 2×813402943² = 1323248695362122498, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813402899 and 813402908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (813402913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406701471 + 406701472.

It is an arithmetic number, because the mean of its divisors is an integer number (406701472).

Almost surely, 2^813402943 is an apocalyptic number.

813402943 is a deficient number, since it is larger than the sum of its proper divisors (1).

813402943 is an equidigital number, since it uses as much as digits as its factorization.

813402943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 813402943 is about 28520.2198974692. The cubic root of 813402943 is about 933.4733273709.

The spelling of 813402943 in words is "eight hundred thirteen million, four hundred two thousand, nine hundred forty-three".