7858948138 has 4 divisors (see below), whose sum is σ = 11788422210. Its totient is φ = 3929474068.

The previous prime is 7858948133. The next prime is 7858948157. The reversal of 7858948138 is 8318498587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8318498587 = 7 ⋅1188356941.

It can be written as a sum of positive squares in only one way, i.e., 5384184129 + 2474764009 = 73377^2 + 49747^2 .

It is not an unprimeable number, because it can be changed into a prime (7858948133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964737033 + ... + 1964737036.

Almost surely, 2^7858948138 is an apocalyptic number.

7858948138 is a deficient number, since it is larger than the sum of its proper divisors (3929474072).

7858948138 is a wasteful number, since it uses less digits than its factorization.

7858948138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929474071.

The product of its digits is 15482880, while the sum is 61.

The square root of 7858948138 is about 88650.7086153292. The cubic root of 7858948138 is about 1988.1759113905.

The spelling of 7858948138 in words is "seven billion, eight hundred fifty-eight million, nine hundred forty-eight thousand, one hundred thirty-eight".