63931940 has 24 divisors (see below), whose sum is σ = 136099320. Its totient is φ = 25221888.

The previous prime is 63931937. The next prime is 63931943. The reversal of 63931940 is 4913936.

63931940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (63931937) and next prime (63931943).

It can be written as a sum of positive squares in 4 ways, for example, as 17255716 + 46676224 = 4154^2 + 6832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 63931940.

It is not an unprimeable number, because it can be changed into a prime (63931943) 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 7 ways as a sum of consecutive naturals, for example, 20435 + ... + 23354.

It is an arithmetic number, because the mean of its divisors is an integer number (5670805).

Almost surely, 2^63931940 is an apocalyptic number.

It is an amenable number.

63931940 is an abundant number, since it is smaller than the sum of its proper divisors (72167380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63931940 is a wasteful number, since it uses less digits than its factorization.

63931940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43871 (or 43869 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 63931940 is about 7995.7451184990. The cubic root of 63931940 is about 399.8581580414.

The spelling of 63931940 in words is "sixty-three million, nine hundred thirty-one thousand, nine hundred forty".