63984381 has 8 divisors (see below), whose sum is σ = 89802720. Its totient is φ = 40411152.

The previous prime is 63984377. The next prime is 63984407. The reversal of 63984381 is 18348936.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63984381 - 2² = 63984377 is a prime.

It is a super-2 number, since 2×63984381² = 8188002023906322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63985381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 561210 + ... + 561323.

It is an arithmetic number, because the mean of its divisors is an integer number (11225340).

Almost surely, 2^63984381 is an apocalyptic number.

It is an amenable number.

63984381 is a deficient number, since it is larger than the sum of its proper divisors (25818339).

63984381 is a wasteful number, since it uses less digits than its factorization.

63984381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122555.

The product of its digits is 124416, while the sum is 42.

The square root of 63984381 is about 7999.0237529339. The cubic root of 63984381 is about 399.9674577692.

The spelling of 63984381 in words is "sixty-three million, nine hundred eighty-four thousand, three hundred eighty-one".