1964638 has 32 divisors (see below), whose sum is σ = 3457440. Its totient is φ = 829440.

The previous prime is 1964629. The next prime is 1964659. The reversal of 1964638 is 8364691.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1964597 and 1964606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20206 + ... + 20302.

It is an arithmetic number, because the mean of its divisors is an integer number (108045).

2^1964638 is an apocalyptic number.

1964638 is a deficient number, since it is larger than the sum of its proper divisors (1492802).

1964638 is a wasteful number, since it uses less digits than its factorization.

1964638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172.

The product of its digits is 31104, while the sum is 37.

The square root of 1964638 is about 1401.6554498164. The cubic root of 1964638 is about 125.2451296441.

The spelling of 1964638 in words is "one million, nine hundred sixty-four thousand, six hundred thirty-eight".