1621964 has 6 divisors (see below), whose sum is σ = 2838444. Its totient is φ = 810980.

The previous prime is 1621933. The next prime is 1621979. The reversal of 1621964 is 4691261.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202742 + ... + 202749.

It is an arithmetic number, because the mean of its divisors is an integer number (473074).

2^1621964 is an apocalyptic number.

It is an amenable number.

1621964 is a deficient number, since it is larger than the sum of its proper divisors (1216480).

1621964 is a wasteful number, since it uses less digits than its factorization.

1621964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405495 (or 405493 counting only the distinct ones).

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

The square root of 1621964 is about 1273.5635045022. The cubic root of 1621964 is about 117.4934717967.

The spelling of 1621964 in words is "one million, six hundred twenty-one thousand, nine hundred sixty-four".