142399 has 4 divisors (see below), whose sum is σ = 143464. Its totient is φ = 141336.

The previous prime is 142391. The next prime is 142403. The reversal of 142399 is 993241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 142399 - 2³ = 142391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142391) 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, 297 + ... + 610.

It is an arithmetic number, because the mean of its divisors is an integer number (35866).

2¹⁴²³⁹⁹ is an apocalyptic number.

142399 is a deficient number, since it is larger than the sum of its proper divisors (1065).

142399 is an equidigital number, since it uses as much as digits as its factorization.

142399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064.

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

The square root of 142399 is about 377.3579202826. The cubic root of 142399 is about 52.2198531863.

The spelling of 142399 in words is "one hundred forty-two thousand, three hundred ninety-nine".