866972394 has 24 divisors (see below), whose sum is σ = 1977306240. Its totient is φ = 273780648.

The previous prime is 866972383. The next prime is 866972401. The reversal of 866972394 is 493279668.

It is a happy number.

It is a super-2 number, since 2×866972394² = 1503282263916182472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866972394.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1267162 + ... + 1267845.

It is an arithmetic number, because the mean of its divisors is an integer number (82387760).

Almost surely, 2^866972394 is an apocalyptic number.

866972394 is an abundant number, since it is smaller than the sum of its proper divisors (1110333846).

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

866972394 is a wasteful number, since it uses less digits than its factorization.

866972394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535034 (or 2535031 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 866972394 is about 29444.3949504825. The cubic root of 866972394 is about 953.5315989688.

The spelling of 866972394 in words is "eight hundred sixty-six million, nine hundred seventy-two thousand, three hundred ninety-four".