399542 has 24 divisors (see below), whose sum is σ = 715008. Its totient is φ = 166320.

The previous prime is 399541. The next prime is 399557. The reversal of 399542 is 245993.

It is a junction number, because it is equal to n+sod(n) for n = 399499 and 399508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3083 + ... + 3209.

It is an arithmetic number, because the mean of its divisors is an integer number (29792).

2³⁹⁹⁵⁴² is an apocalyptic number.

399542 is a deficient number, since it is larger than the sum of its proper divisors (315466).

399542 is a wasteful number, since it uses less digits than its factorization.

399542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 399542 is about 632.0933475366. The cubic root of 399542 is about 73.6524977925.

The spelling of 399542 in words is "three hundred ninety-nine thousand, five hundred forty-two".