399733 has 4 divisors (see below), whose sum is σ = 406348. Its totient is φ = 393120.

The previous prime is 399731. The next prime is 399739. The reversal of 399733 is 337993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 337993 = 31 ⋅10903.

It can be written as a sum of positive squares in 2 ways, for example, as 61009 + 338724 = 247^2 + 582^2 .

It is a cyclic number.

It is not a de Polignac number, because 399733 - 2¹ = 399731 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399731) 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, 3216 + ... + 3337.

It is an arithmetic number, because the mean of its divisors is an integer number (101587).

2³⁹⁹⁷³³ is an apocalyptic number.

It is an amenable number.

399733 is a deficient number, since it is larger than the sum of its proper divisors (6615).

399733 is an equidigital number, since it uses as much as digits as its factorization.

399733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6614.

The product of its digits is 15309, while the sum is 34.

The square root of 399733 is about 632.2444147638. The cubic root of 399733 is about 73.6642323836.

The spelling of 399733 in words is "three hundred ninety-nine thousand, seven hundred thirty-three".