63906403 has 8 divisors (see below), whose sum is σ = 69774336. Its totient is φ = 58048200.

The previous prime is 63906389. The next prime is 63906419. The reversal of 63906403 is 30460936.

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 63906403 - 2¹⁷ = 63775331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63906433) 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, 22218 + ... + 24928.

It is an arithmetic number, because the mean of its divisors is an integer number (8721792).

Almost surely, 2^63906403 is an apocalyptic number.

63906403 is a deficient number, since it is larger than the sum of its proper divisors (5867933).

63906403 is a wasteful number, since it uses less digits than its factorization.

63906403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4865.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 63906403 is about 7994.1480471655. The cubic root of 63906403 is about 399.8049111163.

The spelling of 63906403 in words is "sixty-three million, nine hundred six thousand, four hundred three".