302530138 has 4 divisors (see below), whose sum is σ = 453795210. Its totient is φ = 151265068.

The previous prime is 302530133. The next prime is 302530139. The reversal of 302530138 is 831035203.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831035203 = 631 ⋅1317013.

It can be written as a sum of positive squares in only one way, i.e., 302516449 + 13689 = 17393^2 + 117^2 .

It is not an unprimeable number, because it can be changed into a prime (302530133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75632533 + ... + 75632536.

Almost surely, 2^302530138 is an apocalyptic number.

302530138 is a deficient number, since it is larger than the sum of its proper divisors (151265072).

302530138 is a wasteful number, since it uses less digits than its factorization.

302530138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151265071.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 302530138 is about 17393.3935159301. The cubic root of 302530138 is about 671.3096371156.

The spelling of 302530138 in words is "three hundred two million, five hundred thirty thousand, one hundred thirty-eight".