142155989 has 4 divisors (see below), whose sum is σ = 150518124. Its totient is φ = 133793856.

The previous prime is 142155973. The next prime is 142156037. The reversal of 142155989 is 989551241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66552964 + 75603025 = 8158^2 + 8695^2 .

It is a cyclic number.

It is not a de Polignac number, because 142155989 - 2⁴ = 142155973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142155919) 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, 4181042 + ... + 4181075.

It is an arithmetic number, because the mean of its divisors is an integer number (37629531).

Almost surely, 2^142155989 is an apocalyptic number.

It is an amenable number.

142155989 is a deficient number, since it is larger than the sum of its proper divisors (8362135).

142155989 is an equidigital number, since it uses as much as digits as its factorization.

142155989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362134.

The product of its digits is 129600, while the sum is 44.

The square root of 142155989 is about 11922.9186443589. The cubic root of 142155989 is about 521.9013101058.

The spelling of 142155989 in words is "one hundred forty-two million, one hundred fifty-five thousand, nine hundred eighty-nine".