818942785 has 16 divisors (see below), whose sum is σ = 1041610752. Its totient is φ = 615980800.

The previous prime is 818942777. The next prime is 818942791. The reversal of 818942785 is 587249818.

It is a happy number.

It is not a de Polignac number, because 818942785 - 2³ = 818942777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88320 + ... + 97150.

It is an arithmetic number, because the mean of its divisors is an integer number (65100672).

Almost surely, 2^818942785 is an apocalyptic number.

818942785 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

818942785 is a deficient number, since it is larger than the sum of its proper divisors (222667967).

818942785 is a wasteful number, since it uses less digits than its factorization.

818942785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9944.

The product of its digits is 1290240, while the sum is 52.

The square root of 818942785 is about 28617.1763981005. The cubic root of 818942785 is about 935.5877361302.

The spelling of 818942785 in words is "eight hundred eighteen million, nine hundred forty-two thousand, seven hundred eighty-five".