3994385215 has 4 divisors (see below), whose sum is σ = 4793262264. Its totient is φ = 3195508168.

The previous prime is 3994385203. The next prime is 3994385231. The reversal of 3994385215 is 5125834993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3994385215 - 2²³ = 3985996607 is a prime.

It is a super-2 number, since 2×3994385215² = 31910226491621192450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399438517 + ... + 399438526.

It is an arithmetic number, because the mean of its divisors is an integer number (1198315566).

Almost surely, 2^3994385215 is an apocalyptic number.

3994385215 is a deficient number, since it is larger than the sum of its proper divisors (798877049).

3994385215 is an equidigital number, since it uses as much as digits as its factorization.

3994385215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798877048.

The product of its digits is 1166400, while the sum is 49.

The square root of 3994385215 is about 63201.1488424063. The cubic root of 3994385215 is about 1586.6579612005.

The spelling of 3994385215 in words is "three billion, nine hundred ninety-four million, three hundred eighty-five thousand, two hundred fifteen".