3645819 has 6 divisors (see below), whose sum is σ = 5266196. Its totient is φ = 2430540.

The previous prime is 3645809. The next prime is 3645823. The reversal of 3645819 is 9185463.

3645819 is a `hidden beast` number, since 3 + 645 + 8 + 1 + 9 = 666.

3645819 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 3645819 - 2⁸ = 3645563 is a prime.

It is a super-2 number, since 2×3645819² = 26583992361522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3645809) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202537 + ... + 202554.

Almost surely, 2^3645819 is an apocalyptic number.

3645819 is a deficient number, since it is larger than the sum of its proper divisors (1620377).

3645819 is a wasteful number, since it uses less digits than its factorization.

3645819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405097 (or 405094 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 3645819 is about 1909.4027862135. The cubic root of 3645819 is about 153.9093608422.

The spelling of 3645819 in words is "three million, six hundred forty-five thousand, eight hundred nineteen".