3645870 has 32 divisors (see below), whose sum is σ = 8919072. Its totient is φ = 953472.

The previous prime is 3645823. The next prime is 3645877. The reversal of 3645870 is 785463.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645877) 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, 444 + ... + 2736.

It is an arithmetic number, because the mean of its divisors is an integer number (278721).

Almost surely, 2^3645870 is an apocalyptic number.

3645870 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3645870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4459536).

3645870 is an abundant number, since it is smaller than the sum of its proper divisors (5273202).

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

3645870 is a wasteful number, since it uses less digits than its factorization.

3645870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 3645870 is about 1909.4161411280. The cubic root of 3645870 is about 153.9100784991.

The spelling of 3645870 in words is "three million, six hundred forty-five thousand, eight hundred seventy".