399387093 has 24 divisors (see below), whose sum is σ = 620957088. Its totient is φ = 227668896.

The previous prime is 399387091. The next prime is 399387097. The reversal of 399387093 is 390783993.

It is a happy number.

It is not a de Polignac number, because 399387093 - 2¹ = 399387091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399387091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62055 + ... + 68187.

It is an arithmetic number, because the mean of its divisors is an integer number (25873212).

Almost surely, 2^399387093 is an apocalyptic number.

It is an amenable number.

399387093 is a deficient number, since it is larger than the sum of its proper divisors (221569995).

399387093 is a wasteful number, since it uses less digits than its factorization.

399387093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6593 (or 6586 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 51.

The square root of 399387093 is about 19984.6714508896. The cubic root of 399387093 is about 736.4297792369.

The spelling of 399387093 in words is "three hundred ninety-nine million, three hundred eighty-seven thousand, ninety-three".