142555639 has 4 divisors (see below), whose sum is σ = 147154240. Its totient is φ = 137957040.

The previous prime is 142555631. The next prime is 142555667. The reversal of 142555639 is 936555241.

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 142555639 - 2³ = 142555631 is a prime.

It is a super-2 number, since 2×142555639² = 40644220421396642, which contains 22 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 (142555631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2299254 + ... + 2299315.

It is an arithmetic number, because the mean of its divisors is an integer number (36788560).

Almost surely, 2^142555639 is an apocalyptic number.

142555639 is a deficient number, since it is larger than the sum of its proper divisors (4598601).

142555639 is an equidigital number, since it uses as much as digits as its factorization.

142555639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4598600.

The product of its digits is 162000, while the sum is 40.

The square root of 142555639 is about 11939.6666201364. Note that the first 4 decimals coincide. The cubic root of 142555639 is about 522.3899346163.

The spelling of 142555639 in words is "one hundred forty-two million, five hundred fifty-five thousand, six hundred thirty-nine".