63990403 has 4 divisors (see below), whose sum is σ = 65039488. Its totient is φ = 62941320.

The previous prime is 63990391. The next prime is 63990467. The reversal of 63990403 is 30409936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63990403 - 2¹⁷ = 63859331 is a prime.

It is a super-2 number, since 2×63990403² = 8189543352204818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63990473) 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, 524451 + ... + 524572.

It is an arithmetic number, because the mean of its divisors is an integer number (16259872).

Almost surely, 2^63990403 is an apocalyptic number.

63990403 is a deficient number, since it is larger than the sum of its proper divisors (1049085).

63990403 is a wasteful number, since it uses less digits than its factorization.

63990403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049084.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 63990403 is about 7999.4001650124. The cubic root of 63990403 is about 399.9800052505.

The spelling of 63990403 in words is "sixty-three million, nine hundred ninety thousand, four hundred three".