394587870121 has 4 divisors (see below), whose sum is σ = 394867919700. Its totient is φ = 394307820544.

The previous prime is 394587870067. The next prime is 394587870137. The reversal of 394587870121 is 121078785493.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189207600400 + 205380269721 = 434980^2 + 453189^2 .

It is a cyclic number.

It is not a de Polignac number, because 394587870121 - 2⁷ = 394587869993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394587810121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140022676 + ... + 140025493.

It is an arithmetic number, because the mean of its divisors is an integer number (98716979925).

Almost surely, 2^394587870121 is an apocalyptic number.

It is an amenable number.

394587870121 is a deficient number, since it is larger than the sum of its proper divisors (280049579).

394587870121 is a wasteful number, since it uses less digits than its factorization.

394587870121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280049578.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 394587870121 in words is "three hundred ninety-four billion, five hundred eighty-seven million, eight hundred seventy thousand, one hundred twenty-one".