1840340381 has 8 divisors (see below), whose sum is σ = 2008020000. Its totient is φ = 1672723440.

The previous prime is 1840340351. The next prime is 1840340393. The reversal of 1840340381 is 1830430481.

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 1840340381 - 2¹⁴ = 1840323997 is a prime.

It is a super-2 number, since 2×1840340381² = 6773705435878450322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1840340311) 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, 62870 + ... + 87368.

It is an arithmetic number, because the mean of its divisors is an integer number (251002500).

Almost surely, 2^1840340381 is an apocalyptic number.

1840340381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1840340381 is a deficient number, since it is larger than the sum of its proper divisors (167679619).

1840340381 is a wasteful number, since it uses less digits than its factorization.

1840340381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31339.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1840340381 is about 42899.1885820699. The cubic root of 1840340381 is about 1225.4606915857.

The spelling of 1840340381 in words is "one billion, eight hundred forty million, three hundred forty thousand, three hundred eighty-one".