394213381 has 8 divisors (see below), whose sum is σ = 398109344. Its totient is φ = 390335760.

The previous prime is 394213373. The next prime is 394213411. The reversal of 394213381 is 183312493.

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

It is a cyclic number.

It is not a de Polignac number, because 394213381 - 2³ = 394213373 is a prime.

It is a super-2 number, since 2×394213381² = 310808379518902322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394213301) 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, 40786 + ... + 49516.

It is an arithmetic number, because the mean of its divisors is an integer number (49763668).

Almost surely, 2^394213381 is an apocalyptic number.

It is an amenable number.

394213381 is a deficient number, since it is larger than the sum of its proper divisors (3895963).

394213381 is a wasteful number, since it uses less digits than its factorization.

394213381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9171.

The product of its digits is 15552, while the sum is 34.

The square root of 394213381 is about 19854.8075034738. The cubic root of 394213381 is about 733.2360129576.

The spelling of 394213381 in words is "three hundred ninety-four million, two hundred thirteen thousand, three hundred eighty-one".