1981110 has 16 divisors (see below), whose sum is σ = 4754736. Its totient is φ = 528288.

The previous prime is 1981099. The next prime is 1981141. The reversal of 1981110 is 111891.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32989 + ... + 33048.

It is an arithmetic number, because the mean of its divisors is an integer number (297171).

2^1981110 is an apocalyptic number.

1981110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981110 is an abundant number, since it is smaller than the sum of its proper divisors (2773626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981110 is a wasteful number, since it uses less digits than its factorization.

1981110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66047.

The product of its (nonzero) digits is 72, while the sum is 21.

The square root of 1981110 is about 1407.5190940090. The cubic root of 1981110 is about 125.5941844171.

The spelling of 1981110 in words is "one million, nine hundred eighty-one thousand, one hundred ten".