3640026 has 32 divisors (see below), whose sum is σ = 8184960. Its totient is φ = 1070784.

The previous prime is 3640019. The next prime is 3640027. The reversal of 3640026 is 6200463.

It is a junction number, because it is equal to n+sod(n) for n = 3639984 and 3640011.

It is not an unprimeable number, because it can be changed into a prime (3640027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 780 + ... + 2808.

It is an arithmetic number, because the mean of its divisors is an integer number (255780).

Almost surely, 2^3640026 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3640026, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4092480).

3640026 is an abundant number, since it is smaller than the sum of its proper divisors (4544934).

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

3640026 is a wasteful number, since it uses less digits than its factorization.

3640026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2070.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 3640026 is about 1907.8852166732. The cubic root of 3640026 is about 153.8277998745.

Adding to 3640026 its reverse (6200463), we get a palindrome (9840489).

The spelling of 3640026 in words is "three million, six hundred forty thousand, twenty-six".