1982001 has 24 divisors (see below), whose sum is σ = 3128160. Its totient is φ = 1112832.

The previous prime is 1981997. The next prime is 1982011. The reversal of 1982001 is 1002891.

It is not a de Polignac number, because 1982001 - 2² = 1981997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1982011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14190 + ... + 14328.

It is an arithmetic number, because the mean of its divisors is an integer number (130340).

2^1982001 is an apocalyptic number.

It is an amenable number.

1982001 is a deficient number, since it is larger than the sum of its proper divisors (1146159).

1982001 is a wasteful number, since it uses less digits than its factorization.

1982001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1982001 is about 1407.8355727854. The cubic root of 1982001 is about 125.6130101673.

Adding to 1982001 its reverse (1002891), we get a palindrome (2984892).

The spelling of 1982001 in words is "one million, nine hundred eighty-two thousand, one".