399232705 has 16 divisors (see below), whose sum is σ = 498597120. Its totient is φ = 306507712.

The previous prime is 399232681. The next prime is 399232721. The reversal of 399232705 is 507232993.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 399232705 - 2⁹ = 399232193 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 15972 + ... + 32458.

It is an arithmetic number, because the mean of its divisors is an integer number (31162320).

Almost surely, 2^399232705 is an apocalyptic number.

It is an amenable number.

399232705 is a deficient number, since it is larger than the sum of its proper divisors (99364415).

399232705 is a wasteful number, since it uses less digits than its factorization.

399232705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16688.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 399232705 is about 19980.8084170786. The cubic root of 399232705 is about 736.3348750065.

The spelling of 399232705 in words is "three hundred ninety-nine million, two hundred thirty-two thousand, seven hundred five".