3665890 has 16 divisors (see below), whose sum is σ = 6826680. Its totient is φ = 1415680.

The previous prime is 3665881. The next prime is 3665899. The reversal of 3665890 is 985663.

It is an interprime number because it is at equal distance from previous prime (3665881) and next prime (3665899).

It can be written as a sum of positive squares in 4 ways, for example, as 1640961 + 2024929 = 1281^2 + 1423^2 .

It is not an unprimeable number, because it can be changed into a prime (3665899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6031 + ... + 6610.

Almost surely, 2^3665890 is an apocalyptic number.

3665890 is a deficient number, since it is larger than the sum of its proper divisors (3160790).

3665890 is a wasteful number, since it uses less digits than its factorization.

3665890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12677.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 3665890 is about 1914.6514043031. The cubic root of 3665890 is about 154.1912785964.

The spelling of 3665890 in words is "three million, six hundred sixty-five thousand, eight hundred ninety".