1994624 has 16 divisors (see below), whose sum is σ = 3973920. Its totient is φ = 997248.

The previous prime is 1994623. The next prime is 1994647. The reversal of 1994624 is 4264991.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994621) by changing a digit.

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, 7664 + ... + 7919.

It is an arithmetic number, because the mean of its divisors is an integer number (248370).

2^1994624 is an apocalyptic number.

It is an amenable number.

1994624 is a deficient number, since it is larger than the sum of its proper divisors (1979296).

1994624 is an equidigital number, since it uses as much as digits as its factorization.

1994624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15597 (or 15585 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 1994624 is about 1412.3115803533. The cubic root of 1994624 is about 125.8791147636.

The spelling of 1994624 in words is "one million, nine hundred ninety-four thousand, six hundred twenty-four".