3657521 has 8 divisors (see below), whose sum is σ = 4193664. Its totient is φ = 3124800.

The previous prime is 3657517. The next prime is 3657523. The reversal of 3657521 is 1257563.

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

It is not a de Polignac number, because 3657521 - 2² = 3657517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3657523) 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, 2156 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (524208).

Almost surely, 2^3657521 is an apocalyptic number.

It is an amenable number.

3657521 is a deficient number, since it is larger than the sum of its proper divisors (536143).

3657521 is a wasteful number, since it uses less digits than its factorization.

3657521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711.

The product of its digits is 6300, while the sum is 29.

The square root of 3657521 is about 1912.4646401960. The cubic root of 3657521 is about 154.0738528102.

The spelling of 3657521 in words is "three million, six hundred fifty-seven thousand, five hundred twenty-one".