63389981 has 8 divisors (see below), whose sum is σ = 64850304. Its totient is φ = 61934400.

The previous prime is 63389971. The next prime is 63389999. The reversal of 63389981 is 18998336.

63389981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63389981 is a prime.

It is a super-2 number, since 2×63389981² = 8036579382360722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63389971) 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, 52181 + ... + 53381.

It is an arithmetic number, because the mean of its divisors is an integer number (8106288).

Almost surely, 2^63389981 is an apocalyptic number.

It is an amenable number.

63389981 is a deficient number, since it is larger than the sum of its proper divisors (1460323).

63389981 is a wasteful number, since it uses less digits than its factorization.

63389981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its digits is 279936, while the sum is 47.

The square root of 63389981 is about 7961.7825265452. The cubic root of 63389981 is about 398.7250677702.

The spelling of 63389981 in words is "sixty-three million, three hundred eighty-nine thousand, nine hundred eighty-one".