394244987 has 2 divisors, whose sum is σ = 394244988. Its totient is φ = 394244986.

The previous prime is 394244897. The next prime is 394244989. The reversal of 394244987 is 789442493.

Together with previous prime (394244897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394244987 - 2¹⁰ = 394243963 is a prime.

Together with 394244989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394244989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197122493 + 197122494.

It is an arithmetic number, because the mean of its divisors is an integer number (197122494).

Almost surely, 2^394244987 is an apocalyptic number.

394244987 is a deficient number, since it is larger than the sum of its proper divisors (1).

394244987 is an equidigital number, since it uses as much as digits as its factorization.

394244987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 50.

The square root of 394244987 is about 19855.6034156608. The cubic root of 394244987 is about 733.2556081305.

The spelling of 394244987 in words is "three hundred ninety-four million, two hundred forty-four thousand, nine hundred eighty-seven".