394139 has 4 divisors (see below), whose sum is σ = 407760. Its totient is φ = 380520.

The previous prime is 394129. The next prime is 394153. The reversal of 394139 is 931493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 931493 = 47 ⋅19819.

It is a cyclic number.

It is not a de Polignac number, because 394139 - 2⁴ = 394123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 13591 = 394139 / (3 + 9 + 4 + 1 + 3 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394129) 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, 6767 + ... + 6824.

It is an arithmetic number, because the mean of its divisors is an integer number (101940).

2³⁹⁴¹³⁹ is an apocalyptic number.

394139 is a deficient number, since it is larger than the sum of its proper divisors (13621).

394139 is a wasteful number, since it uses less digits than its factorization.

394139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620.

The product of its digits is 2916, while the sum is 29.

The square root of 394139 is about 627.8049060019. The cubic root of 394139 is about 73.3189893892.

The spelling of 394139 in words is "three hundred ninety-four thousand, one hundred thirty-nine".