3645878 has 4 divisors (see below), whose sum is σ = 5468820. Its totient is φ = 1822938.

The previous prime is 3645877. The next prime is 3645893. The reversal of 3645878 is 8785463.

It is a happy number.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 911468 + ... + 911471.

It is an arithmetic number, because the mean of its divisors is an integer number (1367205).

Almost surely, 2^3645878 is an apocalyptic number.

3645878 is a deficient number, since it is larger than the sum of its proper divisors (1822942).

3645878 is a wasteful number, since it uses less digits than its factorization.

3645878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822941.

The product of its digits is 161280, while the sum is 41.

The square root of 3645878 is about 1909.4182360080. The cubic root of 3645878 is about 153.9101910721.

The spelling of 3645878 in words is "three million, six hundred forty-five thousand, eight hundred seventy-eight".