821862394 has 16 divisors (see below), whose sum is σ = 1255142880. Its totient is φ = 403504560.

The previous prime is 821862383. The next prime is 821862403. The reversal of 821862394 is 493268128.

It is a super-2 number, since 2×821862394² = 1350915589342822472, 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 821862394.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70077 + ... + 80959.

It is an arithmetic number, because the mean of its divisors is an integer number (78446430).

Almost surely, 2^821862394 is an apocalyptic number.

821862394 is a deficient number, since it is larger than the sum of its proper divisors (433280486).

821862394 is a wasteful number, since it uses less digits than its factorization.

821862394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11565.

The product of its digits is 165888, while the sum is 43.

The square root of 821862394 is about 28668.1424930183. The cubic root of 821862394 is about 936.6982372786.

The spelling of 821862394 in words is "eight hundred twenty-one million, eight hundred sixty-two thousand, three hundred ninety-four".