142429721 has 20 divisors (see below), whose sum is σ = 167757492. Its totient is φ = 120911616.

The previous prime is 142429697. The next prime is 142429753. The reversal of 142429721 is 127924241.

It is a happy number.

142429721 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 2 ways, for example, as 46389721 + 96040000 = 6811^2 + 9800^2 .

It is not a de Polignac number, because 142429721 - 2²⁶ = 75320857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142459721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 328721 + ... + 329153.

Almost surely, 2^142429721 is an apocalyptic number.

It is an amenable number.

142429721 is a deficient number, since it is larger than the sum of its proper divisors (25327771).

142429721 is an frugal number, since it uses more digits than its factorization.

142429721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598 (or 577 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 142429721 is about 11934.3923598983. The cubic root of 142429721 is about 522.2360820039.

The spelling of 142429721 in words is "one hundred forty-two million, four hundred twenty-nine thousand, seven hundred twenty-one".