1981383 has 8 divisors (see below), whose sum is σ = 2648448. Its totient is φ = 1317624.

The previous prime is 1981361. The next prime is 1981393. The reversal of 1981383 is 3831891.

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

It is not a de Polignac number, because 1981383 - 2¹⁸ = 1719239 is a prime.

It is a super-3 number, since 3×1981383³ = 23336007310853726661, which contains 333 as substring.

1981383 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981393) 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, 1566 + ... + 2532.

It is an arithmetic number, because the mean of its divisors is an integer number (331056).

2^1981383 is an apocalyptic number.

1981383 is a deficient number, since it is larger than the sum of its proper divisors (667065).

1981383 is an equidigital number, since it uses as much as digits as its factorization.

1981383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653.

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

The square root of 1981383 is about 1407.6160698145. The cubic root of 1981383 is about 125.5999531759.

The spelling of 1981383 in words is "one million, nine hundred eighty-one thousand, three hundred eighty-three".