142139997 has 6 divisors (see below), whose sum is σ = 205313342. Its totient is φ = 94759992.

The previous prime is 142139981. The next prime is 142140029. The reversal of 142139997 is 799931241.

142139997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 111070521 + 31069476 = 10539^2 + 5574^2 .

It is not a de Polignac number, because 142139997 - 2⁴ = 142139981 is a prime.

It is a super-3 number, since 3×142139997³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142139917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7896658 + ... + 7896675.

Almost surely, 2^142139997 is an apocalyptic number.

It is an amenable number.

142139997 is a deficient number, since it is larger than the sum of its proper divisors (63173345).

142139997 is a wasteful number, since it uses less digits than its factorization.

142139997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15793339 (or 15793336 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 142139997 is about 11922.2479843358. The cubic root of 142139997 is about 521.8817387443.

The spelling of 142139997 in words is "one hundred forty-two million, one hundred thirty-nine thousand, nine hundred ninety-seven".