1981716 has 24 divisors (see below), whose sum is σ = 5044704. Its totient is φ = 600480.

The previous prime is 1981711. The next prime is 1981739. The reversal of 1981716 is 6171891.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981711) 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 7 ways as a sum of consecutive naturals, for example, 7375 + ... + 7638.

It is an arithmetic number, because the mean of its divisors is an integer number (210196).

2^1981716 is an apocalyptic number.

It is an amenable number.

1981716 is an abundant number, since it is smaller than the sum of its proper divisors (3062988).

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

1981716 is a wasteful number, since it uses less digits than its factorization.

1981716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15031 (or 15029 counting only the distinct ones).

The product of its digits is 3024, while the sum is 33.

The square root of 1981716 is about 1407.7343499396. The cubic root of 1981716 is about 125.6069890765.

The spelling of 1981716 in words is "one million, nine hundred eighty-one thousand, seven hundred sixteen".