63997943 has 8 divisors (see below), whose sum is σ = 64937280. Its totient is φ = 63064800.

The previous prime is 63997873. The next prime is 63997951. The reversal of 63997943 is 34979936.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 63997943 - 2²⁴ = 47220727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63997891 and 63997900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63997993) 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, 21746 + ... + 24512.

It is an arithmetic number, because the mean of its divisors is an integer number (8117160).

Almost surely, 2^63997943 is an apocalyptic number.

63997943 is a deficient number, since it is larger than the sum of its proper divisors (939337).

63997943 is a wasteful number, since it uses less digits than its factorization.

63997943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097.

The product of its digits is 1102248, while the sum is 50.

The square root of 63997943 is about 7999.8714364670. The cubic root of 63997943 is about 399.9957145374.

The spelling of 63997943 in words is "sixty-three million, nine hundred ninety-seven thousand, nine hundred forty-three".