825491394 has 48 divisors (see below), whose sum is σ = 2201314752. Its totient is φ = 217711584.

The previous prime is 825491371. The next prime is 825491441. The reversal of 825491394 is 493194528.

825491394 is a `hidden beast` number, since 8 + 2 + 549 + 13 + 94 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250344 + ... + 253619.

It is an arithmetic number, because the mean of its divisors is an integer number (45860724).

Almost surely, 2^825491394 is an apocalyptic number.

825491394 is an abundant number, since it is smaller than the sum of its proper divisors (1375823358).

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

825491394 is a wasteful number, since it uses less digits than its factorization.

825491394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503991 (or 503988 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 825491394 is about 28731.3660308729. The cubic root of 825491394 is about 938.0749019948.

The spelling of 825491394 in words is "eight hundred twenty-five million, four hundred ninety-one thousand, three hundred ninety-four".