63939 has 4 divisors (see below), whose sum is σ = 85256. Its totient is φ = 42624.

The previous prime is 63929. The next prime is 63949. The reversal of 63939 is 93936.

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

It is an interprime number because it is at equal distance from previous prime (63929) and next prime (63949).

It is not a de Polignac number, because 63939 - 2⁵ = 63907 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (63929) 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, 10654 + ... + 10659.

It is an arithmetic number, because the mean of its divisors is an integer number (21314).

2⁶³⁹³⁹ is an apocalyptic number.

63939 is a deficient number, since it is larger than the sum of its proper divisors (21317).

63939 is a wasteful number, since it uses less digits than its factorization.

63939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21316.

The product of its digits is 4374, while the sum is 30.

The square root of 63939 is about 252.8616222364. The cubic root of 63939 is about 39.9872876270.

The spelling of 63939 in words is "sixty-three thousand, nine hundred thirty-nine".