3645390 has 32 divisors (see below), whose sum is σ = 9999360. Its totient is φ = 833184.

The previous prime is 3645377. The next prime is 3645391. The reversal of 3645390 is 935463.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8470 + ... + 8889.

It is an arithmetic number, because the mean of its divisors is an integer number (312480).

Almost surely, 2^3645390 is an apocalyptic number.

3645390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3645390 is an abundant number, since it is smaller than the sum of its proper divisors (6353970).

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

3645390 is a wasteful number, since it uses less digits than its factorization.

3645390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17376.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 3645390 is about 1909.2904441179. The cubic root of 3645390 is about 153.9033238168.

The spelling of 3645390 in words is "three million, six hundred forty-five thousand, three hundred ninety".