3639972 has 48 divisors (see below), whose sum is σ = 10281600. Its totient is φ = 978432.

The previous prime is 3639971. The next prime is 3639973. The reversal of 3639972 is 2799363.

3639972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3639971) and next prime (3639973).

It is a self number, because there is not a number n which added to its sum of digits gives 3639972.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3639971) 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, 154 + ... + 2702.

It is an arithmetic number, because the mean of its divisors is an integer number (214200).

Almost surely, 2^3639972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3639972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5140800).

3639972 is an abundant number, since it is smaller than the sum of its proper divisors (6641628).

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

3639972 is a wasteful number, since it uses less digits than its factorization.

3639972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580 (or 2578 counting only the distinct ones).

The product of its digits is 61236, while the sum is 39.

The square root of 3639972 is about 1907.8710648259. The cubic root of 3639972 is about 153.8270391893.

The spelling of 3639972 in words is "three million, six hundred thirty-nine thousand, nine hundred seventy-two".