4921816 has 24 divisors (see below), whose sum is σ = 9655380. Its totient is φ = 2351888.

The previous prime is 4921811. The next prime is 4921841. The reversal of 4921816 is 6181294.

It is a happy number.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4921811) 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 in 5 ways as a sum of consecutive naturals, for example, 3651 + ... + 4813.

Almost surely, 2^4921816 is an apocalyptic number.

4921816 is a gapful number since it is divisible by the number (46) formed by its first and last digit.

It is an amenable number.

4921816 is a deficient number, since it is larger than the sum of its proper divisors (4733564).

4921816 is a wasteful number, since it uses less digits than its factorization.

4921816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215 (or 1188 counting only the distinct ones).

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

The square root of 4921816 is about 2218.5166215289. The cubic root of 4921816 is about 170.1016232069.

The spelling of 4921816 in words is "four million, nine hundred twenty-one thousand, eight hundred sixteen".