305714138 has 4 divisors (see below), whose sum is σ = 458571210. Its totient is φ = 152857068.

The previous prime is 305714131. The next prime is 305714159. The reversal of 305714138 is 831417503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831417503 = 7 ⋅118773929.

It can be written as a sum of positive squares in only one way, i.e., 157678249 + 148035889 = 12557^2 + 12167^2 .

It is a super-2 number, since 2×305714138² = 186922268346166088, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (305714131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76428533 + ... + 76428536.

Almost surely, 2^305714138 is an apocalyptic number.

305714138 is a deficient number, since it is larger than the sum of its proper divisors (152857072).

305714138 is a wasteful number, since it uses less digits than its factorization.

305714138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152857071.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 305714138 is about 17484.6829539457. The cubic root of 305714138 is about 673.6565050522.

The spelling of 305714138 in words is "three hundred five million, seven hundred fourteen thousand, one hundred thirty-eight".