3645445 has 16 divisors (see below), whose sum is σ = 4677120. Its totient is φ = 2721600.

The previous prime is 3645419. The next prime is 3645449. The reversal of 3645445 is 5445463.

It is not a de Polignac number, because 3645445 - 2¹⁵ = 3612677 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

3645445 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645449) 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, 4090 + ... + 4900.

It is an arithmetic number, because the mean of its divisors is an integer number (292320).

Almost surely, 2^3645445 is an apocalyptic number.

It is an amenable number.

3645445 is a deficient number, since it is larger than the sum of its proper divisors (1031675).

3645445 is a wasteful number, since it uses less digits than its factorization.

3645445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 28800, while the sum is 31.

The square root of 3645445 is about 1909.3048473201. The cubic root of 3645445 is about 153.9040978209.

The spelling of 3645445 in words is "three million, six hundred forty-five thousand, four hundred forty-five".