3657638 has 8 divisors (see below), whose sum is σ = 5502288. Its totient is φ = 1823544.

The previous prime is 3657637. The next prime is 3657649. The reversal of 3657638 is 8367563.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3657631) 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, 1706 + ... + 3197.

It is an arithmetic number, because the mean of its divisors is an integer number (687786).

Almost surely, 2^3657638 is an apocalyptic number.

3657638 is a deficient number, since it is larger than the sum of its proper divisors (1844650).

3657638 is a wasteful number, since it uses less digits than its factorization.

3657638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278.

The product of its digits is 90720, while the sum is 38.

The square root of 3657638 is about 1912.4952287522. The cubic root of 3657638 is about 154.0754956760.

The spelling of 3657638 in words is "three million, six hundred fifty-seven thousand, six hundred thirty-eight".