1982391 has 16 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 1265600.

The previous prime is 1982381. The next prime is 1982401. The reversal of 1982391 is 1932891.

It is an interprime number because it is at equal distance from previous prime (1982381) and next prime (1982401).

It is a cyclic number.

It is not a de Polignac number, because 1982391 - 2⁷ = 1982263 is a prime.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8620 + ... + 8846.

It is an arithmetic number, because the mean of its divisors is an integer number (172368).

2^1982391 is an apocalyptic number.

1982391 is a deficient number, since it is larger than the sum of its proper divisors (775497).

1982391 is a wasteful number, since it uses less digits than its factorization.

1982391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342.

The product of its digits is 3888, while the sum is 33.

The square root of 1982391 is about 1407.9740764659. The cubic root of 1982391 is about 125.6212486194.

The spelling of 1982391 in words is "one million, nine hundred eighty-two thousand, three hundred ninety-one".