3729645 has 20 divisors (see below), whose sum is σ = 6686460. Its totient is φ = 1988928.

The previous prime is 3729629. The next prime is 3729659. The reversal of 3729645 is 5469273.

3729645 is a `hidden beast` number, since 3 + 7 + 2 + 9 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 927369 + 2802276 = 963^2 + 1674^2 .

It is not a de Polignac number, because 3729645 - 2⁴ = 3729629 is a prime.

It is a super-3 number, since 3×3729645³ (a number of 21 digits) contains 333 as substring.

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 19 ways as a sum of consecutive naturals, for example, 4200 + ... + 5009.

It is an arithmetic number, because the mean of its divisors is an integer number (334323).

Almost surely, 2^3729645 is an apocalyptic number.

It is an amenable number.

3729645 is a deficient number, since it is larger than the sum of its proper divisors (2956815).

3729645 is an equidigital number, since it uses as much as digits as its factorization.

3729645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9226 (or 9217 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 3729645 is about 1931.2288833797. The cubic root of 3729645 is about 155.0800141857.

The spelling of 3729645 in words is "three million, seven hundred twenty-nine thousand, six hundred forty-five".