142399688 has 12 divisors (see below), whose sum is σ = 267062715. Its totient is φ = 71182968.

The previous prime is 142399651. The next prime is 142399721. The reversal of 142399688 is 886993241.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 71199844 + 71199844 = 8438^2 + 8438^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8438.

It is a super-2 number, since 2×142399688² = 40555342284994688, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31643 + ... + 35861.

Almost surely, 2^142399688 is an apocalyptic number.

It is an amenable number.

142399688 is a deficient number, since it is larger than the sum of its proper divisors (124663027).

142399688 is an frugal number, since it uses more digits than its factorization.

142399688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8444 (or 4221 counting only the distinct ones).

The product of its digits is 746496, while the sum is 50.

The square root of 142399688 is about 11933.1340393042. The cubic root of 142399688 is about 522.1993728614.

Multiplying 142399688 by its sum of digits (50), we get a square (7119984400 = 84380²).

The spelling of 142399688 in words is "one hundred forty-two million, three hundred ninety-nine thousand, six hundred eighty-eight".