142918309 has 8 divisors (see below), whose sum is σ = 146939768. Its totient is φ = 138905280.

The previous prime is 142918291. The next prime is 142918313. The reversal of 142918309 is 903819241.

It can be written as a sum of positive squares in 4 ways, for example, as 62457409 + 80460900 = 7903^2 + 8970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 142918309 - 2²³ = 134529701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142918319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49699 + ... + 52495.

It is an arithmetic number, because the mean of its divisors is an integer number (18367471).

Almost surely, 2^142918309 is an apocalyptic number.

It is an amenable number.

142918309 is a deficient number, since it is larger than the sum of its proper divisors (4021459).

142918309 is a wasteful number, since it uses less digits than its factorization.

142918309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 142918309 is about 11954.8445828459. The cubic root of 142918309 is about 522.8325564676.

The spelling of 142918309 in words is "one hundred forty-two million, nine hundred eighteen thousand, three hundred nine".