3690021 has 8 divisors (see below), whose sum is σ = 4942080. Its totient is φ = 2448992.

The previous prime is 3690013. The next prime is 3690031. The reversal of 3690021 is 1200963.

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

It is a cyclic number.

It is not a de Polignac number, because 3690021 - 2³ = 3690013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3690021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3690031) 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, 1941 + ... + 3338.

It is an arithmetic number, because the mean of its divisors is an integer number (617760).

Almost surely, 2^3690021 is an apocalyptic number.

It is an amenable number.

3690021 is a deficient number, since it is larger than the sum of its proper divisors (1252059).

3690021 is a wasteful number, since it uses less digits than its factorization.

3690021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5515.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 3690021 is about 1920.9427373037. The cubic root of 3690021 is about 154.5288642252.

Adding to 3690021 its reverse (1200963), we get a palindrome (4890984).

The spelling of 3690021 in words is "three million, six hundred ninety thousand, twenty-one".