812423477 has 4 divisors (see below), whose sum is σ = 812903916. Its totient is φ = 811943040.

The previous prime is 812423473. The next prime is 812423509. The reversal of 812423477 is 774324218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 774324218 = 2 ⋅387162109.

It can be written as a sum of positive squares in 2 ways, for example, as 427910596 + 384512881 = 20686^2 + 19609^2 .

It is a cyclic number.

It is not a de Polignac number, because 812423477 - 2² = 812423473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 812423477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812423471) 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, 237674 + ... + 241067.

It is an arithmetic number, because the mean of its divisors is an integer number (203225979).

Almost surely, 2^812423477 is an apocalyptic number.

It is an amenable number.

812423477 is a deficient number, since it is larger than the sum of its proper divisors (480439).

812423477 is a wasteful number, since it uses less digits than its factorization.

812423477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480438.

The product of its digits is 75264, while the sum is 38.

The square root of 812423477 is about 28503.0432936555. The cubic root of 812423477 is about 933.0984936229.

The spelling of 812423477 in words is "eight hundred twelve million, four hundred twenty-three thousand, four hundred seventy-seven".