399402005 has 16 divisors (see below), whose sum is σ = 490682880. Its totient is φ = 311955072.

The previous prime is 399401987. The next prime is 399402019. The reversal of 399402005 is 500204993.

It is a cyclic number.

It is not a de Polignac number, because 399402005 - 2¹⁴ = 399385621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105536 + ... + 109254.

It is an arithmetic number, because the mean of its divisors is an integer number (30667680).

Almost surely, 2^399402005 is an apocalyptic number.

It is an amenable number.

399402005 is a deficient number, since it is larger than the sum of its proper divisors (91280875).

399402005 is a wasteful number, since it uses less digits than its factorization.

399402005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 399402005 is about 19985.0445333504. The cubic root of 399402005 is about 736.4389445341.

Adding to 399402005 its reverse (500204993), we get a palindrome (899606998).

The spelling of 399402005 in words is "three hundred ninety-nine million, four hundred two thousand, five".