3639220 has 24 divisors (see below), whose sum is σ = 8230824. Its totient is φ = 1343616.

The previous prime is 3639217. The next prime is 3639277. The reversal of 3639220 is 229363.

It can be written as a sum of positive squares in 4 ways, for example, as 51984 + 3587236 = 228^2 + 1894^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6739 + ... + 7258.

It is an arithmetic number, because the mean of its divisors is an integer number (342951).

Almost surely, 2^3639220 is an apocalyptic number.

It is an amenable number.

3639220 is an abundant number, since it is smaller than the sum of its proper divisors (4591604).

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

3639220 is a wasteful number, since it uses less digits than its factorization.

3639220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14019 (or 14017 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 3639220 is about 1907.6739763387. The cubic root of 3639220 is about 153.8164451609.

The spelling of 3639220 in words is "three million, six hundred thirty-nine thousand, two hundred twenty".