64939 has 4 divisors (see below), whose sum is σ = 74224. Its totient is φ = 55656.

The previous prime is 64937. The next prime is 64951. The reversal of 64939 is 93946.

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 64939 - 2¹ = 64937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64939.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64937) 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, 4632 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (18556).

2⁶⁴⁹³⁹ is an apocalyptic number.

64939 is a deficient number, since it is larger than the sum of its proper divisors (9285).

64939 is an equidigital number, since it uses as much as digits as its factorization.

64939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9284.

The product of its digits is 5832, while the sum is 31.

The square root of 64939 is about 254.8313167568. The cubic root of 64939 is about 40.1946759944.

The spelling of 64939 in words is "sixty-four thousand, nine hundred thirty-nine".