399142 has 8 divisors (see below), whose sum is σ = 624816. Its totient is φ = 190872.

The previous prime is 399137. The next prime is 399149. The reversal of 399142 is 241993.

It is a happy number.

399142 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 399142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399149) by changing a digit.

399142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4293 + ... + 4384.

It is an arithmetic number, because the mean of its divisors is an integer number (78102).

2³⁹⁹¹⁴² is an apocalyptic number.

399142 is a deficient number, since it is larger than the sum of its proper divisors (225674).

399142 is a wasteful number, since it uses less digits than its factorization.

399142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702.

The product of its digits is 1944, while the sum is 28.

The square root of 399142 is about 631.7768593420. The cubic root of 399142 is about 73.6279106100.

The spelling of 399142 in words is "three hundred ninety-nine thousand, one hundred forty-two".