394218421138 has 16 divisors (see below), whose sum is σ = 591968200824. Its totient is φ = 196895784960.

The previous prime is 394218421061. The next prime is 394218421141. The reversal of 394218421138 is 831124812493.

It can be written as a sum of positive squares in 4 ways, for example, as 381717615889 + 12500805249 = 617833^2 + 111807^2 .

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, 8945478 + ... + 8989438.

Almost surely, 2^394218421138 is an apocalyptic number.

394218421138 is a deficient number, since it is larger than the sum of its proper divisors (197749779686).

394218421138 is a wasteful number, since it uses less digits than its factorization.

394218421138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48717.

The product of its digits is 331776, while the sum is 46.

The spelling of 394218421138 in words is "three hundred ninety-four billion, two hundred eighteen million, four hundred twenty-one thousand, one hundred thirty-eight".