394290681 has 8 divisors (see below), whose sum is σ = 525844704. Its totient is φ = 262798560.

The previous prime is 394290671. The next prime is 394290703. The reversal of 394290681 is 186092493.

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

It is not a de Polignac number, because 394290681 - 2⁷ = 394290553 is a prime.

It is a super-2 number, since 2×394290681² = 310930282246887522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394290671) 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, 2310 + ... + 28176.

It is an arithmetic number, because the mean of its divisors is an integer number (65730588).

Almost surely, 2^394290681 is an apocalyptic number.

It is an amenable number.

394290681 is a deficient number, since it is larger than the sum of its proper divisors (131554023).

394290681 is a wasteful number, since it uses less digits than its factorization.

394290681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30951.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 394290681 is about 19856.7540398727. The cubic root of 394290681 is about 733.2839357681.

The spelling of 394290681 in words is "three hundred ninety-four million, two hundred ninety thousand, six hundred eighty-one".