63981946 has 48 divisors (see below), whose sum is σ = 118195200. Its totient is φ = 25857888.

The previous prime is 63981943. The next prime is 63981947. The reversal of 63981946 is 64918936.

63981946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 63981896 and 63981905.

It is not an unprimeable number, because it can be changed into a prime (63981943) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 133335 + ... + 133813.

It is an arithmetic number, because the mean of its divisors is an integer number (2462400).

Almost surely, 2^63981946 is an apocalyptic number.

63981946 is a deficient number, since it is larger than the sum of its proper divisors (54213254).

63981946 is a wasteful number, since it uses less digits than its factorization.

63981946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571 (or 564 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 63981946 is about 7998.8715454119. The cubic root of 63981946 is about 399.9623839627.

The spelling of 63981946 in words is "sixty-three million, nine hundred eighty-one thousand, nine hundred forty-six".