1838840681 has 8 divisors (see below), whose sum is σ = 1867005504. Its totient is φ = 1810819120.

The previous prime is 1838840623. The next prime is 1838840713. The reversal of 1838840681 is 1860488381.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1838840681 - 2¹⁰ = 1838839657 is a prime.

It is a super-2 number, since 2×1838840681² = 6762670100201087522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1834840681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9806 + ... + 61431.

It is an arithmetic number, because the mean of its divisors is an integer number (233375688).

Almost surely, 2^1838840681 is an apocalyptic number.

It is an amenable number.

1838840681 is a deficient number, since it is larger than the sum of its proper divisors (28164823).

1838840681 is an equidigital number, since it uses as much as digits as its factorization.

1838840681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71631.

The product of its (nonzero) digits is 294912, while the sum is 47.

The square root of 1838840681 is about 42881.7056680352. The cubic root of 1838840681 is about 1225.1277236810.

The spelling of 1838840681 in words is "one billion, eight hundred thirty-eight million, eight hundred forty thousand, six hundred eighty-one".