1964621 has 4 divisors (see below), whose sum is σ = 1974144. Its totient is φ = 1955100.

The previous prime is 1964617. The next prime is 1964623. The reversal of 1964621 is 1264691.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1264691 = 167 ⋅7573.

It is a cyclic number.

It is not a de Polignac number, because 1964621 - 2² = 1964617 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 (1964623) 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, 4445 + ... + 4866.

It is an arithmetic number, because the mean of its divisors is an integer number (493536).

2^1964621 is an apocalyptic number.

It is an amenable number.

1964621 is a deficient number, since it is larger than the sum of its proper divisors (9523).

1964621 is an equidigital number, since it uses as much as digits as its factorization.

1964621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522.

The product of its digits is 2592, while the sum is 29.

The square root of 1964621 is about 1401.6493855455. The cubic root of 1964621 is about 125.2447683946.

The spelling of 1964621 in words is "one million, nine hundred sixty-four thousand, six hundred twenty-one".