399437 has 4 divisors (see below), whose sum is σ = 420480. Its totient is φ = 378396.

The previous prime is 399433. The next prime is 399439. The reversal of 399437 is 734993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 734993 = 7 ⋅104999.

It is a cyclic number.

It is not a de Polignac number, because 399437 - 2² = 399433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399397 and 399406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399433) 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, 10493 + ... + 10530.

It is an arithmetic number, because the mean of its divisors is an integer number (105120).

2³⁹⁹⁴³⁷ is an apocalyptic number.

It is an amenable number.

399437 is a deficient number, since it is larger than the sum of its proper divisors (21043).

399437 is a wasteful number, since it uses less digits than its factorization.

399437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21042.

The product of its digits is 20412, while the sum is 35.

The square root of 399437 is about 632.0102847264. The cubic root of 399437 is about 73.6460452462.

The spelling of 399437 in words is "three hundred ninety-nine thousand, four hundred thirty-seven".