1982591 has 8 divisors (see below), whose sum is σ = 2260944. Its totient is φ = 1722240.

The previous prime is 1982587. The next prime is 1982599. The reversal of 1982591 is 1952891.

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

It is not a de Polignac number, because 1982591 - 2² = 1982587 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982599) 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, 4265 + ... + 4706.

It is an arithmetic number, because the mean of its divisors is an integer number (282618).

2^1982591 is an apocalyptic number.

1982591 is a deficient number, since it is larger than the sum of its proper divisors (278353).

1982591 is a wasteful number, since it uses less digits than its factorization.

1982591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9001.

The product of its digits is 6480, while the sum is 35.

The square root of 1982591 is about 1408.0450987096. The cubic root of 1982591 is about 125.6254730476.

The spelling of 1982591 in words is "one million, nine hundred eighty-two thousand, five hundred ninety-one".