142155439 has 4 divisors (see below), whose sum is σ = 143178280. Its totient is φ = 141132600.

The previous prime is 142155427. The next prime is 142155457. The reversal of 142155439 is 934551241.

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 142155439 - 2⁵ = 142155407 is a prime.

It is a super-3 number, since 3×142155439³ (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 (142155499) 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, 511212 + ... + 511489.

It is an arithmetic number, because the mean of its divisors is an integer number (35794570).

Almost surely, 2^142155439 is an apocalyptic number.

142155439 is a deficient number, since it is larger than the sum of its proper divisors (1022841).

142155439 is a wasteful number, since it uses less digits than its factorization.

142155439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022840.

The product of its digits is 21600, while the sum is 34.

The square root of 142155439 is about 11922.8955795142. The cubic root of 142155439 is about 521.9006370281.

The spelling of 142155439 in words is "one hundred forty-two million, one hundred fifty-five thousand, four hundred thirty-nine".