394331087 has 2 divisors, whose sum is σ = 394331088. Its totient is φ = 394331086.

The previous prime is 394331083. The next prime is 394331101. The reversal of 394331087 is 780133493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394331087 - 2² = 394331083 is a prime.

It is equal to p_21049994 and since 394331087 and 21049994 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394331087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394331083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197165543 + 197165544.

It is an arithmetic number, because the mean of its divisors is an integer number (197165544).

Almost surely, 2^394331087 is an apocalyptic number.

394331087 is a deficient number, since it is larger than the sum of its proper divisors (1).

394331087 is an equidigital number, since it uses as much as digits as its factorization.

394331087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 394331087 is about 19857.7714509962. The cubic root of 394331087 is about 733.3089833283.

The spelling of 394331087 in words is "three hundred ninety-four million, three hundred thirty-one thousand, eighty-seven".