812423478 has 16 divisors (see below), whose sum is σ = 1625166576. Its totient is φ = 270754560.

The previous prime is 812423473. The next prime is 812423509. The reversal of 812423478 is 874324218.

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 7 ways as a sum of consecutive naturals, for example, 31150 + ... + 50942.

It is an arithmetic number, because the mean of its divisors is an integer number (101572911).

Almost surely, 2^812423478 is an apocalyptic number.

812423478 is an abundant number, since it is smaller than the sum of its proper divisors (812743098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

812423478 is a wasteful number, since it uses less digits than its factorization.

812423478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26639.

The product of its digits is 86016, while the sum is 39.

The square root of 812423478 is about 28503.0433111975. The cubic root of 812423478 is about 933.0984940058.

The spelling of 812423478 in words is "eight hundred twelve million, four hundred twenty-three thousand, four hundred seventy-eight".