394252939 has 4 divisors (see below), whose sum is σ = 403421656. Its totient is φ = 385084224.

The previous prime is 394252879. The next prime is 394252973. The reversal of 394252939 is 939252493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 939252493 = 29 ⋅32388017.

It is a cyclic number.

It is not a de Polignac number, because 394252939 - 2⁷ = 394252811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394259939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4584294 + ... + 4584379.

It is an arithmetic number, because the mean of its divisors is an integer number (100855414).

Almost surely, 2^394252939 is an apocalyptic number.

394252939 is a deficient number, since it is larger than the sum of its proper divisors (9168717).

394252939 is an equidigital number, since it uses as much as digits as its factorization.

394252939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9168716.

The product of its digits is 524880, while the sum is 46.

The square root of 394252939 is about 19855.8036603911. The cubic root of 394252939 is about 733.2605380680.

The spelling of 394252939 in words is "three hundred ninety-four million, two hundred fifty-two thousand, nine hundred thirty-nine".