3655669 has 4 divisors (see below), whose sum is σ = 3715660. Its totient is φ = 3595680.

The previous prime is 3655667. The next prime is 3655681. The reversal of 3655669 is 9665563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9665563 = 523 ⋅18481.

It can be written as a sum of positive squares in 2 ways, for example, as 184900 + 3470769 = 430^2 + 1863^2 .

It is a cyclic number.

It is not a de Polignac number, because 3655669 - 2¹ = 3655667 is a prime.

It is a super-2 number, since 2×3655669² = 26727831675122, which contains 22 as substring.

It is a Duffinian number.

3655669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3655661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29904 + ... + 30025.

It is an arithmetic number, because the mean of its divisors is an integer number (928915).

Almost surely, 2^3655669 is an apocalyptic number.

It is an amenable number.

3655669 is a deficient number, since it is larger than the sum of its proper divisors (59991).

3655669 is an equidigital number, since it uses as much as digits as its factorization.

3655669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59990.

The product of its digits is 145800, while the sum is 40.

The square root of 3655669 is about 1911.9803869287. The cubic root of 3655669 is about 154.0478431212.

The spelling of 3655669 in words is "three million, six hundred fifty-five thousand, six hundred sixty-nine".