842261138 has 4 divisors (see below), whose sum is σ = 1263391710. Its totient is φ = 421130568.

The previous prime is 842261117. The next prime is 842261159. The reversal of 842261138 is 831162248.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (842261117) and next prime (842261159).

It can be written as a sum of positive squares in only one way, i.e., 497156209 + 345104929 = 22297^2 + 18577^2 .

It is a junction number, because it is equal to n+sod(n) for n = 842261098 and 842261107.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210565283 + ... + 210565286.

Almost surely, 2^842261138 is an apocalyptic number.

842261138 is a deficient number, since it is larger than the sum of its proper divisors (421130572).

842261138 is a wasteful number, since it uses less digits than its factorization.

842261138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421130571.

The product of its digits is 18432, while the sum is 35.

The square root of 842261138 is about 29021.7356131573. The cubic root of 842261138 is about 944.3846531939.

The spelling of 842261138 in words is "eight hundred forty-two million, two hundred sixty-one thousand, one hundred thirty-eight".