63903989 has 4 divisors (see below), whose sum is σ = 65965440. Its totient is φ = 61842540.

The previous prime is 63903979. The next prime is 63904007. The reversal of 63903989 is 98930936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63903989 - 2²⁰ = 62855413 is a prime.

It is a super-2 number, since 2×63903989² = 8167439620224242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63903949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1030679 + ... + 1030740.

It is an arithmetic number, because the mean of its divisors is an integer number (16491360).

Almost surely, 2^63903989 is an apocalyptic number.

It is an amenable number.

63903989 is a deficient number, since it is larger than the sum of its proper divisors (2061451).

63903989 is a wasteful number, since it uses less digits than its factorization.

63903989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2061450.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 63903989 is about 7993.9970602947. The cubic root of 63903989 is about 399.7998769770.

Adding to 63903989 its sum of digits (47), we get a square (63904036 = 7994²).

The spelling of 63903989 in words is "sixty-three million, nine hundred three thousand, nine hundred eighty-nine".