1964821 has 4 divisors (see below), whose sum is σ = 2050272. Its totient is φ = 1879372.

The previous prime is 1964813. The next prime is 1964827. The reversal of 1964821 is 1284691.

1964821 = T₁₁₄₃ + T₁₁₄₄ + T₁₁₄₅.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1964821 - 2³ = 1964813 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964827) 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, 42691 + ... + 42736.

It is an arithmetic number, because the mean of its divisors is an integer number (512568).

2^1964821 is an apocalyptic number.

1964821 is the 1145-th centered triangular number.

It is an amenable number.

1964821 is a deficient number, since it is larger than the sum of its proper divisors (85451).

1964821 is an equidigital number, since it uses as much as digits as its factorization.

1964821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85450.

The product of its digits is 3456, while the sum is 31.

The square root of 1964821 is about 1401.7207282480. The cubic root of 1964821 is about 125.2490182565.

The spelling of 1964821 in words is "one million, nine hundred sixty-four thousand, eight hundred twenty-one".