394033139 has 4 divisors (see below), whose sum is σ = 395378256. Its totient is φ = 392688024.

The previous prime is 394033127. The next prime is 394033163. The reversal of 394033139 is 931330493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931330493 = 61 ⋅15267713.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394033139 is a prime.

It is a super-2 number, since 2×394033139² = 310524229260386642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394033099 and 394033108.

It is not an unprimeable number, because it can be changed into a prime (394030139) 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, 672119 + ... + 672704.

It is an arithmetic number, because the mean of its divisors is an integer number (98844564).

Almost surely, 2^394033139 is an apocalyptic number.

394033139 is a deficient number, since it is larger than the sum of its proper divisors (1345117).

394033139 is a wasteful number, since it uses less digits than its factorization.

394033139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345116.

The product of its (nonzero) digits is 26244, while the sum is 35.

The square root of 394033139 is about 19850.2679830777. The cubic root of 394033139 is about 733.1242460153.

The spelling of 394033139 in words is "three hundred ninety-four million, thirty-three thousand, one hundred thirty-nine".