302157139 has 4 divisors (see below), whose sum is σ = 302247856. Its totient is φ = 302066424.

The previous prime is 302157131. The next prime is 302157143. The reversal of 302157139 is 931751203.

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 302157139 - 2³ = 302157131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 302157139.

It is not an unprimeable number, because it can be changed into a prime (302157131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40164 + ... + 47089.

It is an arithmetic number, because the mean of its divisors is an integer number (75561964).

Almost surely, 2^302157139 is an apocalyptic number.

302157139 is a deficient number, since it is larger than the sum of its proper divisors (90717).

302157139 is an equidigital number, since it uses as much as digits as its factorization.

302157139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90716.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 302157139 is about 17382.6677756897. The cubic root of 302157139 is about 671.0336306728.

The spelling of 302157139 in words is "three hundred two million, one hundred fifty-seven thousand, one hundred thirty-nine".