812879874 has 40 divisors (see below), whose sum is σ = 1828474560. Its totient is φ = 269915544.

The previous prime is 812879863. The next prime is 812879897. The reversal of 812879874 is 478978218.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 812879874.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33067 + ... + 52145.

It is an arithmetic number, because the mean of its divisors is an integer number (45711864).

Almost surely, 2^812879874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812879874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (914237280).

812879874 is an abundant number, since it is smaller than the sum of its proper divisors (1015594686).

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

812879874 is a wasteful number, since it uses less digits than its factorization.

812879874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356 (or 19347 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 54.

The square root of 812879874 is about 28511.0482795705. The cubic root of 812879874 is about 933.2731905407.

The spelling of 812879874 in words is "eight hundred twelve million, eight hundred seventy-nine thousand, eight hundred seventy-four".