1964891 has 4 divisors (see below), whose sum is σ = 1967784. Its totient is φ = 1962000.

The previous prime is 1964887. The next prime is 1964899. The reversal of 1964891 is 1984691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1984691 = 53 ⋅37447.

It is a cyclic number.

It is not a de Polignac number, because 1964891 - 2² = 1964887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 191 + ... + 1991.

It is an arithmetic number, because the mean of its divisors is an integer number (491946).

2^1964891 is an apocalyptic number.

1964891 is a deficient number, since it is larger than the sum of its proper divisors (2893).

1964891 is a wasteful number, since it uses less digits than its factorization.

1964891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2892.

The product of its digits is 15552, while the sum is 38.

The square root of 1964891 is about 1401.7456973360. The cubic root of 1964891 is about 125.2505056400.

The spelling of 1964891 in words is "one million, nine hundred sixty-four thousand, eight hundred ninety-one".