1964661 has 8 divisors (see below), whose sum is σ = 2637504. Its totient is φ = 1300800.

The previous prime is 1964659. The next prime is 1964671. The reversal of 1964661 is 1664691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1964661 - 2¹ = 1964659 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1716 + ... + 2621.

It is an arithmetic number, because the mean of its divisors is an integer number (329688).

2^1964661 is an apocalyptic number.

It is an amenable number.

1964661 is a deficient number, since it is larger than the sum of its proper divisors (672843).

1964661 is a wasteful number, since it uses less digits than its factorization.

1964661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4491.

The product of its digits is 7776, while the sum is 33.

The square root of 1964661 is about 1401.6636543765. The cubic root of 1964661 is about 125.2456183901.

The spelling of 1964661 in words is "one million, nine hundred sixty-four thousand, six hundred sixty-one".