394000987 has 2 divisors, whose sum is σ = 394000988. Its totient is φ = 394000986.

The previous prime is 394000963. The next prime is 394001009. The reversal of 394000987 is 789000493.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394000987 is a prime.

It is not a weakly prime, because it can be changed into another prime (394000907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197000493 + 197000494.

It is an arithmetic number, because the mean of its divisors is an integer number (197000494).

Almost surely, 2^394000987 is an apocalyptic number.

394000987 is a deficient number, since it is larger than the sum of its proper divisors (1).

394000987 is an equidigital number, since it uses as much as digits as its factorization.

394000987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 394000987 is about 19849.4581034345. The cubic root of 394000987 is about 733.1043051782.

The spelling of 394000987 in words is "three hundred ninety-four million, nine hundred eighty-seven", and thus it is an aban number.