394987 has 2 divisors, whose sum is σ = 394988. Its totient is φ = 394986.

The previous prime is 394981. The next prime is 394993. The reversal of 394987 is 789493.

It is a balanced prime because it is at equal distance from previous prime (394981) and next prime (394993).

It is an emirp because it is prime and its reverse (789493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394987 is a prime.

It is not a weakly prime, because it can be changed into another prime (394981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197493 + 197494.

It is an arithmetic number, because the mean of its divisors is an integer number (197494).

2³⁹⁴⁹⁸⁷ is an apocalyptic number.

394987 is a deficient number, since it is larger than the sum of its proper divisors (1).

394987 is an equidigital number, since it uses as much as digits as its factorization.

394987 is an evil number, because the sum of its binary digits is even.

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

The square root of 394987 is about 628.4799121690. The cubic root of 394987 is about 73.3715342750.

The spelling of 394987 in words is "three hundred ninety-four thousand, nine hundred eighty-seven".