1981708 has 24 divisors (see below), whose sum is σ = 3612672. Its totient is φ = 950544.

The previous prime is 1981699. The next prime is 1981711. The reversal of 1981708 is 8071891.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 15541 + ... + 15667.

It is an arithmetic number, because the mean of its divisors is an integer number (150528).

2^1981708 is an apocalyptic number.

It is an amenable number.

1981708 is a deficient number, since it is larger than the sum of its proper divisors (1630964).

1981708 is a wasteful number, since it uses less digits than its factorization.

1981708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261 (or 259 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1981708 is about 1407.7315084916. The cubic root of 1981708 is about 125.6068200551.

The spelling of 1981708 in words is "one million, nine hundred eighty-one thousand, seven hundred eight".