1838668381 has 4 divisors (see below), whose sum is σ = 2005820064. Its totient is φ = 1671516700.

The previous prime is 1838668379. The next prime is 1838668423.

1838668381 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1838668381 - 2¹ = 1838668379 is a prime.

It is a super-2 number, since 2×1838668381² = 6761402830578322322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838668331) 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, 83575825 + ... + 83575846.

It is an arithmetic number, because the mean of its divisors is an integer number (501455016).

Almost surely, 2^1838668381 is an apocalyptic number.

1838668381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1838668381 is a deficient number, since it is larger than the sum of its proper divisors (167151683).

1838668381 is a wasteful number, since it uses less digits than its factorization.

1838668381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167151682.

The product of its digits is 1327104, while the sum is 52.

The square root of 1838668381 is about 42879.6966057364. The cubic root of 1838668381 is about 1225.0894575237.

The spelling of 1838668381 in words is "one billion, eight hundred thirty-eight million, six hundred sixty-eight thousand, three hundred eighty-one".