394001685 has 128 divisors (see below), whose sum is σ = 904089600. Its totient is φ = 157973760.

The previous prime is 394001683. The next prime is 394001687. The reversal of 394001685 is 586100493.

It is an interprime number because it is at equal distance from previous prime (394001683) and next prime (394001687).

It is not a de Polignac number, because 394001685 - 2¹ = 394001683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394001683) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 300802 + ... + 302108.

It is an arithmetic number, because the mean of its divisors is an integer number (7063200).

Almost surely, 2^394001685 is an apocalyptic number.

394001685 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

394001685 is an abundant number, since it is smaller than the sum of its proper divisors (510087915).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394001685 is a wasteful number, since it uses less digits than its factorization.

394001685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 394001685 is about 19849.4756857706. The cubic root of 394001685 is about 733.1047380930.

The spelling of 394001685 in words is "three hundred ninety-four million, one thousand, six hundred eighty-five".