3660638 has 4 divisors (see below), whose sum is σ = 5490960. Its totient is φ = 1830318.

The previous prime is 3660637. The next prime is 3660647. The reversal of 3660638 is 8360663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8360663 = 2467 ⋅3389.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3660637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 915158 + ... + 915161.

It is an arithmetic number, because the mean of its divisors is an integer number (1372740).

Almost surely, 2^3660638 is an apocalyptic number.

3660638 is a deficient number, since it is larger than the sum of its proper divisors (1830322).

3660638 is a wasteful number, since it uses less digits than its factorization.

3660638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830321.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 3660638 is about 1913.2793836761. The cubic root of 3660638 is about 154.1176084795.

The spelling of 3660638 in words is "three million, six hundred sixty thousand, six hundred thirty-eight".