399893409 has 32 divisors (see below), whose sum is σ = 602112000. Its totient is φ = 262280592.

The previous prime is 399893407. The next prime is 399893411. The reversal of 399893409 is 904398993.

It is an interprime number because it is at equal distance from previous prime (399893407) and next prime (399893411).

It is not a de Polignac number, because 399893409 - 2¹ = 399893407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399893407) 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 31 ways as a sum of consecutive naturals, for example, 476212 + ... + 477050.

It is an arithmetic number, because the mean of its divisors is an integer number (18816000).

Almost surely, 2^399893409 is an apocalyptic number.

It is an amenable number.

399893409 is a deficient number, since it is larger than the sum of its proper divisors (202218591).

399893409 is a wasteful number, since it uses less digits than its factorization.

399893409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1108 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 54.

The square root of 399893409 is about 19997.3350474507. The cubic root of 399893409 is about 736.7408464802.

The spelling of 399893409 in words is "three hundred ninety-nine million, eight hundred ninety-three thousand, four hundred nine".