394340687 has 16 divisors (see below), whose sum is σ = 473326560. Its totient is φ = 324559872.

The previous prime is 394340647. The next prime is 394340693. The reversal of 394340687 is 786043493.

It is a happy number.

It is not a de Polignac number, because 394340687 - 2⁶ = 394340623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394340647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42758 + ... + 51155.

It is an arithmetic number, because the mean of its divisors is an integer number (29582910).

Almost surely, 2^394340687 is an apocalyptic number.

394340687 is a deficient number, since it is larger than the sum of its proper divisors (78985873).

394340687 is a wasteful number, since it uses less digits than its factorization.

394340687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93962.

The product of its (nonzero) digits is 435456, while the sum is 44.

The square root of 394340687 is about 19858.0131684920. The cubic root of 394340687 is about 733.3149340884.

It can be divided in two parts, 3943406 and 87, that added together give a palindrome (3943493).

The spelling of 394340687 in words is "three hundred ninety-four million, three hundred forty thousand, six hundred eighty-seven".