399092987 has 16 divisors (see below), whose sum is σ = 422641152. Its totient is φ = 376104960.

The previous prime is 399092963. The next prime is 399093001. The reversal of 399092987 is 789290993.

It is a cyclic number.

It is not a de Polignac number, because 399092987 - 2⁶ = 399092923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399092887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632162 + ... + 632792.

It is an arithmetic number, because the mean of its divisors is an integer number (26415072).

Almost surely, 2^399092987 is an apocalyptic number.

399092987 is a deficient number, since it is larger than the sum of its proper divisors (23548165).

399092987 is a wasteful number, since it uses less digits than its factorization.

399092987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The square root of 399092987 is about 19977.3118061465. The cubic root of 399092987 is about 736.2489675157.

The spelling of 399092987 in words is "three hundred ninety-nine million, ninety-two thousand, nine hundred eighty-seven".