399494387 has 2 divisors, whose sum is σ = 399494388. Its totient is φ = 399494386.

The previous prime is 399494363. The next prime is 399494411. The reversal of 399494387 is 783494993.

It is a balanced prime because it is at equal distance from previous prime (399494363) and next prime (399494411).

It is a cyclic number.

It is not a de Polignac number, because 399494387 - 2¹⁰ = 399493363 is a prime.

It is not a weakly prime, because it can be changed into another prime (399494317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199747193 + 199747194.

It is an arithmetic number, because the mean of its divisors is an integer number (199747194).

Almost surely, 2^399494387 is an apocalyptic number.

399494387 is a deficient number, since it is larger than the sum of its proper divisors (1).

399494387 is an equidigital number, since it uses as much as digits as its factorization.

399494387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 399494387 is about 19987.3556780280. The cubic root of 399494387 is about 736.4957197939.

The spelling of 399494387 in words is "three hundred ninety-nine million, four hundred ninety-four thousand, three hundred eighty-seven".