399804605 has 8 divisors (see below), whose sum is σ = 482202072. Its totient is φ = 318219328.

The previous prime is 399804547. The next prime is 399804617. The reversal of 399804605 is 506408993.

It can be written as a sum of positive squares in 4 ways, for example, as 72267001 + 327537604 = 8501^2 + 18098^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399804605 - 2⁶ = 399804541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201962 + ... + 203931.

It is an arithmetic number, because the mean of its divisors is an integer number (60275259).

Almost surely, 2^399804605 is an apocalyptic number.

It is an amenable number.

399804605 is a deficient number, since it is larger than the sum of its proper divisors (82397467).

399804605 is a wasteful number, since it uses less digits than its factorization.

399804605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406095.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 399804605 is about 19995.1145283042. The cubic root of 399804605 is about 736.6863066318.

The spelling of 399804605 in words is "three hundred ninety-nine million, eight hundred four thousand, six hundred five".