1838665141 has 4 divisors (see below), whose sum is σ = 1946821932. Its totient is φ = 1730508352.

The previous prime is 1838665097. The next prime is 1838665177. The reversal of 1838665141 is 1415668381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1415668381 = 3583 ⋅395107.

It can be written as a sum of positive squares in 2 ways, for example, as 1378562641 + 460102500 = 37129^2 + 21450^2 .

It is a cyclic number.

It is not a de Polignac number, because 1838665141 - 2¹³ = 1838656949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838665181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54078370 + ... + 54078403.

It is an arithmetic number, because the mean of its divisors is an integer number (486705483).

Almost surely, 2^1838665141 is an apocalyptic number.

It is an amenable number.

1838665141 is a deficient number, since it is larger than the sum of its proper divisors (108156791).

1838665141 is a wasteful number, since it uses less digits than its factorization.

1838665141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108156790.

The product of its digits is 138240, while the sum is 43.

The square root of 1838665141 is about 42879.6588256017. The cubic root of 1838665141 is about 1225.0887379283.

The spelling of 1838665141 in words is "one billion, eight hundred thirty-eight million, six hundred sixty-five thousand, one hundred forty-one".