1821964 has 6 divisors (see below), whose sum is σ = 3188444. Its totient is φ = 910980.

The previous prime is 1821959. The next prime is 1821997. The reversal of 1821964 is 4691281.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227742 + ... + 227749.

2^1821964 is an apocalyptic number.

It is an amenable number.

1821964 is a deficient number, since it is larger than the sum of its proper divisors (1366480).

1821964 is a wasteful number, since it uses less digits than its factorization.

1821964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455495 (or 455493 counting only the distinct ones).

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

The square root of 1821964 is about 1349.8014668832. The cubic root of 1821964 is about 122.1368168579.

The spelling of 1821964 in words is "one million, eight hundred twenty-one thousand, nine hundred sixty-four".