1964689 has 4 divisors (see below), whose sum is σ = 1968624. Its totient is φ = 1960756.

The previous prime is 1964671. The next prime is 1964719. The reversal of 1964689 is 9864691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9864691 = 139 ⋅70969.

It is a cyclic number.

It is not a de Polignac number, because 1964689 - 2⁷ = 1964561 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1964629) 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, 1087 + ... + 2260.

It is an arithmetic number, because the mean of its divisors is an integer number (492156).

2^1964689 is an apocalyptic number.

It is an amenable number.

1964689 is a deficient number, since it is larger than the sum of its proper divisors (3935).

1964689 is an equidigital number, since it uses as much as digits as its factorization.

1964689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934.

The product of its digits is 93312, while the sum is 43.

The square root of 1964689 is about 1401.6736424717. The cubic root of 1964689 is about 125.2462133800.

The spelling of 1964689 in words is "one million, nine hundred sixty-four thousand, six hundred eighty-nine".