1981707 has 48 divisors (see below), whose sum is σ = 3562272. Its totient is φ = 967680.

The previous prime is 1981699. The next prime is 1981711. The reversal of 1981707 is 7071891.

It is not a de Polignac number, because 1981707 - 2³ = 1981699 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1981787) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32457 + ... + 32517.

It is an arithmetic number, because the mean of its divisors is an integer number (74214).

2^1981707 is an apocalyptic number.

1981707 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1981707 is a deficient number, since it is larger than the sum of its proper divisors (1580565).

1981707 is a wasteful number, since it uses less digits than its factorization.

1981707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 1981707 is about 1407.7311533102. The cubic root of 1981707 is about 125.6067989274.

The spelling of 1981707 in words is "one million, nine hundred eighty-one thousand, seven hundred seven".