394137839 has 8 divisors (see below), whose sum is σ = 401999760. Its totient is φ = 386291776.

The previous prime is 394137803. The next prime is 394137841. The reversal of 394137839 is 938731493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394137839 is a prime.

It is a super-2 number, since 2×394137839² = 310689272263179842, 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 = 394137793 and 394137802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394139839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54752 + ... + 61530.

It is an arithmetic number, because the mean of its divisors is an integer number (50249970).

Almost surely, 2^394137839 is an apocalyptic number.

394137839 is a deficient number, since it is larger than the sum of its proper divisors (7861921).

394137839 is a wasteful number, since it uses less digits than its factorization.

394137839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7929.

The product of its digits is 489888, while the sum is 47.

The square root of 394137839 is about 19852.9050519061. The cubic root of 394137839 is about 733.1891739815.

The spelling of 394137839 in words is "three hundred ninety-four million, one hundred thirty-seven thousand, eight hundred thirty-nine".