394970139815 has 8 divisors (see below), whose sum is σ = 475581794688. Its totient is φ = 314897693920.

The previous prime is 394970139757. The next prime is 394970139841. The reversal of 394970139815 is 518931079493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 394970139815 - 2²⁰ = 394969091239 is a prime.

It is a super-2 number, since 2×394970139815² (a number of 24 digits) 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 7 ways as a sum of consecutive naturals, for example, 134800631 + ... + 134803560.

It is an arithmetic number, because the mean of its divisors is an integer number (59447724336).

Almost surely, 2^394970139815 is an apocalyptic number.

394970139815 is a deficient number, since it is larger than the sum of its proper divisors (80611654873).

394970139815 is a wasteful number, since it uses less digits than its factorization.

394970139815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269604489.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 394970139815 in words is "three hundred ninety-four billion, nine hundred seventy million, one hundred thirty-nine thousand, eight hundred fifteen".