399629 has 4 divisors (see below), whose sum is σ = 402684. Its totient is φ = 396576.

The previous prime is 399617. The next prime is 399643. The reversal of 399629 is 926993.

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

It can be written as a sum of positive squares in 2 ways, for example, as 348100 + 51529 = 590^2 + 227^2 .

It is a cyclic number.

It is not a de Polignac number, because 399629 - 2⁴ = 399613 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 399592 and 399601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399689) 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, 1322 + ... + 1595.

It is an arithmetic number, because the mean of its divisors is an integer number (100671).

2³⁹⁹⁶²⁹ is an apocalyptic number.

It is an amenable number.

399629 is a deficient number, since it is larger than the sum of its proper divisors (3055).

399629 is a wasteful number, since it uses less digits than its factorization.

399629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3054.

The product of its digits is 26244, while the sum is 38.

The square root of 399629 is about 632.1621627399. The cubic root of 399629 is about 73.6578433317.

The spelling of 399629 in words is "three hundred ninety-nine thousand, six hundred twenty-nine".