399449 has 4 divisors (see below), whose sum is σ = 422964. Its totient is φ = 375936.

The previous prime is 399439. The next prime is 399473. The reversal of 399449 is 944993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 944993 = 7 ⋅134999.

It can be written as a sum of positive squares in 2 ways, for example, as 313600 + 85849 = 560^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 399449 - 2⁴ = 399433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399409) 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, 11732 + ... + 11765.

It is an arithmetic number, because the mean of its divisors is an integer number (105741).

2³⁹⁹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

399449 is a deficient number, since it is larger than the sum of its proper divisors (23515).

399449 is a wasteful number, since it uses less digits than its factorization.

399449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23514.

The product of its digits is 34992, while the sum is 38.

The square root of 399449 is about 632.0197781715. The cubic root of 399449 is about 73.6467827373.

It can be divided in two parts, 399 and 449, that added together give a palindrome (848).

The spelling of 399449 in words is "three hundred ninety-nine thousand, four hundred forty-nine".