393999822 has 16 divisors (see below), whose sum is σ = 875555280. Its totient is φ = 131333256.

The previous prime is 393999811. The next prime is 393999833. The reversal of 393999822 is 228999393.

It is an interprime number because it is at equal distance from previous prime (393999811) and next prime (393999833).

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 7296293 = 393999822 / (3 + 9 + 3 + 9 + 9 + 9 + 8 + 2 + 2).

It is a congruent number.

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, 3648093 + ... + 3648200.

It is an arithmetic number, because the mean of its divisors is an integer number (54722205).

Almost surely, 2^393999822 is an apocalyptic number.

393999822 is an abundant number, since it is smaller than the sum of its proper divisors (481555458).

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

393999822 is a wasteful number, since it uses less digits than its factorization.

393999822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7296304 (or 7296298 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 54.

The square root of 393999822 is about 19849.4287575235. The cubic root of 393999822 is about 733.1035826188.

The spelling of 393999822 in words is "three hundred ninety-three million, nine hundred ninety-nine thousand, eight hundred twenty-two".