1964681 has 4 divisors (see below), whose sum is σ = 1974852. Its totient is φ = 1954512.

The previous prime is 1964671. The next prime is 1964719. The reversal of 1964681 is 1864691.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1190281 + 774400 = 1091^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964681 - 2⁶ = 1964617 is a prime.

It is a super-2 number, since 2×1964681² = 7719942863522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964671) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4790 + ... + 5183.

It is an arithmetic number, because the mean of its divisors is an integer number (493713).

2^1964681 is an apocalyptic number.

It is an amenable number.

1964681 is a deficient number, since it is larger than the sum of its proper divisors (10171).

1964681 is an equidigital number, since it uses as much as digits as its factorization.

1964681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10170.

The product of its digits is 10368, while the sum is 35.

The square root of 1964681 is about 1401.6707887375. The cubic root of 1964681 is about 125.2460433835.

The spelling of 1964681 in words is "one million, nine hundred sixty-four thousand, six hundred eighty-one".