1833981 has 8 divisors (see below), whose sum is σ = 2453280. Its totient is φ = 1218672.

The previous prime is 1833961. The next prime is 1833983. The reversal of 1833981 is 1893381.

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

It is not a de Polignac number, because 1833981 - 2¹¹ = 1831933 is a prime.

It is a super-2 number, since 2×1833981² = 6726972616722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

1833981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1833983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (306660).

2^1833981 is an apocalyptic number.

1833981 is the 857-th centered pentagonal number.

It is an amenable number.

1833981 is a deficient number, since it is larger than the sum of its proper divisors (619299).

1833981 is a wasteful number, since it uses less digits than its factorization.

1833981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1995.

The product of its digits is 5184, while the sum is 33.

The square root of 1833981 is about 1354.2455464206. The cubic root of 1833981 is about 122.4047517272.

The spelling of 1833981 in words is "one million, eight hundred thirty-three thousand, nine hundred eighty-one".