1969664 has 20 divisors (see below), whose sum is σ = 3936504. Its totient is φ = 984576.

The previous prime is 1969661. The next prime is 1969691. The reversal of 1969664 is 4669691.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1969661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1412 + ... + 2435.

2^1969664 is an apocalyptic number.

It is an amenable number.

1969664 is a deficient number, since it is larger than the sum of its proper divisors (1966840).

1969664 is an frugal number, since it uses more digits than its factorization.

1969664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865 (or 3849 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 1969664 is about 1403.4471846137. The cubic root of 1969664 is about 125.3518407356.

The spelling of 1969664 in words is "one million, nine hundred sixty-nine thousand, six hundred sixty-four".