4639986 has 48 divisors (see below), whose sum is σ = 11007360. Its totient is φ = 1404000.

The previous prime is 4639979. The next prime is 4639993. The reversal of 4639986 is 6899364.

4639986 is a `hidden beast` number, since 4 + 639 + 9 + 8 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (4639979) and next prime (4639993).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18361 + ... + 18611.

It is an arithmetic number, because the mean of its divisors is an integer number (229320).

Almost surely, 2^4639986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4639986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5503680).

4639986 is an abundant number, since it is smaller than the sum of its proper divisors (6367374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4639986 is a wasteful number, since it uses less digits than its factorization.

4639986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 348 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 4639986 is about 2154.0626731829. The cubic root of 4639986 is about 166.7908505583.

It can be divided in two parts, 4639 and 986, that added together give a square (5625 = 75²).

The spelling of 4639986 in words is "four million, six hundred thirty-nine thousand, nine hundred eighty-six".