399759 has 4 divisors (see below), whose sum is σ = 533016. Its totient is φ = 266504.

The previous prime is 399757. The next prime is 399761. The reversal of 399759 is 957993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (399757) and next prime (399761).

It is a cyclic number.

It is not a de Polignac number, because 399759 - 2¹ = 399757 is a prime.

It is a D-number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 399759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66624 + ... + 66629.

It is an arithmetic number, because the mean of its divisors is an integer number (133254).

2³⁹⁹⁷⁵⁹ is an apocalyptic number.

399759 is a deficient number, since it is larger than the sum of its proper divisors (133257).

399759 is a wasteful number, since it uses less digits than its factorization.

399759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133256.

The product of its digits is 76545, while the sum is 42.

The square root of 399759 is about 632.2649760978. The cubic root of 399759 is about 73.6658294735.

The spelling of 399759 in words is "three hundred ninety-nine thousand, seven hundred fifty-nine".