1982651 has 4 divisors (see below), whose sum is σ = 2162904. Its totient is φ = 1802400.

The previous prime is 1982641. The next prime is 1982671. The reversal of 1982651 is 1562891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1982651 - 2⁶ = 1982587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90110 + ... + 90131.

It is an arithmetic number, because the mean of its divisors is an integer number (540726).

2^1982651 is an apocalyptic number.

1982651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1982651 is a deficient number, since it is larger than the sum of its proper divisors (180253).

1982651 is a wasteful number, since it uses less digits than its factorization.

1982651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180252.

The product of its digits is 4320, while the sum is 32.

The square root of 1982651 is about 1408.0664046841. The cubic root of 1982651 is about 125.6267403206.

The spelling of 1982651 in words is "one million, nine hundred eighty-two thousand, six hundred fifty-one".