10639986 has 32 divisors (see below), whose sum is σ = 24724608. Its totient is φ = 2989440.

The previous prime is 10639949. The next prime is 10639987. The reversal of 10639986 is 68993601.

It is a super-2 number, since 2×10639986² = 226418604160392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (10639987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 486 + ... + 4638.

It is an arithmetic number, because the mean of its divisors is an integer number (772644).

Almost surely, 2^10639986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10639986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12362304).

10639986 is an abundant number, since it is smaller than the sum of its proper divisors (14084622).

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

10639986 is a wasteful number, since it uses less digits than its factorization.

10639986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 10639986 is about 3261.8991400716. The cubic root of 10639986 is about 219.9447933102.

The spelling of 10639986 in words is "ten million, six hundred thirty-nine thousand, nine hundred eighty-six".