142028639 has 4 divisors (see below), whose sum is σ = 146610240. Its totient is φ = 137447040.

The previous prime is 142028617. The next prime is 142028647. The reversal of 142028639 is 936820241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 142028639 - 2¹² = 142024543 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142028599 and 142028608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142028239) 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, 2290754 + ... + 2290815.

It is an arithmetic number, because the mean of its divisors is an integer number (36652560).

Almost surely, 2^142028639 is an apocalyptic number.

142028639 is a deficient number, since it is larger than the sum of its proper divisors (4581601).

142028639 is an equidigital number, since it uses as much as digits as its factorization.

142028639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4581600.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 142028639 is about 11917.5768929762. The cubic root of 142028639 is about 521.7454156563.

The spelling of 142028639 in words is "one hundred forty-two million, twenty-eight thousand, six hundred thirty-nine".