1840363981 has 8 divisors (see below), whose sum is σ = 1848572928. Its totient is φ = 1832166000.

The previous prime is 1840363963. The next prime is 1840364023. The reversal of 1840363981 is 1893630481.

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 1840363981 - 2¹¹ = 1840361933 is a prime.

It is a super-2 number, since 2×1840363981² = 6773879165124336722, 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 (1840366981) 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, 700851 + ... + 703471.

It is an arithmetic number, because the mean of its divisors is an integer number (231071616).

Almost surely, 2^1840363981 is an apocalyptic number.

It is an amenable number.

1840363981 is a deficient number, since it is larger than the sum of its proper divisors (8208947).

1840363981 is a wasteful number, since it uses less digits than its factorization.

1840363981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1840363981 is about 42899.4636446658. The cubic root of 1840363981 is about 1225.4659298827.

The spelling of 1840363981 in words is "one billion, eight hundred forty million, three hundred sixty-three thousand, nine hundred eighty-one".