394307491 has 8 divisors (see below), whose sum is σ = 397602000. Its totient is φ = 391021920.

The previous prime is 394307489. The next prime is 394307497. The reversal of 394307491 is 194703493.

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 not a de Polignac number, because 394307491 - 2¹ = 394307489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394307497) 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, 108321 + ... + 111901.

It is an arithmetic number, because the mean of its divisors is an integer number (49700250).

Almost surely, 2^394307491 is an apocalyptic number.

394307491 is a deficient number, since it is larger than the sum of its proper divisors (3294509).

394307491 is a wasteful number, since it uses less digits than its factorization.

394307491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4469.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 394307491 is about 19857.1773170307. The cubic root of 394307491 is about 733.2943564454.

The spelling of 394307491 in words is "three hundred ninety-four million, three hundred seven thousand, four hundred ninety-one".