394081939 has 4 divisors (see below), whose sum is σ = 394182360. Its totient is φ = 393981520.

The previous prime is 394081927. The next prime is 394081969. The reversal of 394081939 is 939180493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939180493 = 227 ⋅4137359.

It is a cyclic number.

It is not a de Polignac number, because 394081939 - 2¹⁹ = 393557651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394081969) 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, 44074 + ... + 52255.

It is an arithmetic number, because the mean of its divisors is an integer number (98545590).

Almost surely, 2^394081939 is an apocalyptic number.

394081939 is a deficient number, since it is larger than the sum of its proper divisors (100421).

394081939 is an equidigital number, since it uses as much as digits as its factorization.

394081939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100420.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 394081939 is about 19851.4971475705. The cubic root of 394081939 is about 733.1545099558.

The spelling of 394081939 in words is "three hundred ninety-four million, eighty-one thousand, nine hundred thirty-nine".