1964021 has 4 divisors (see below), whose sum is σ = 2001132. Its totient is φ = 1926912.

The previous prime is 1964009. The next prime is 1964033. The reversal of 1964021 is 1204691.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1204691 = 31 ⋅38861.

It is an interprime number because it is at equal distance from previous prime (1964009) and next prime (1964033).

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 302500 = 1289^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1964021 - 2¹⁰ = 1962997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1964041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18476 + ... + 18581.

It is an arithmetic number, because the mean of its divisors is an integer number (500283).

2^1964021 is an apocalyptic number.

It is an amenable number.

1964021 is a deficient number, since it is larger than the sum of its proper divisors (37111).

1964021 is an equidigital number, since it uses as much as digits as its factorization.

1964021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37110.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1964021 is about 1401.4353356470. The cubic root of 1964021 is about 125.2320170782.

The spelling of 1964021 in words is "one million, nine hundred sixty-four thousand, twenty-one".