3690621 has 18 divisors (see below), whose sum is σ = 5861310. Its totient is φ = 2236080.

The previous prime is 3690619. The next prime is 3690623. The reversal of 3690621 is 1260963.

It is a happy number.

3690621 is a `hidden beast` number, since 36 + 9 + 0 + 621 = 666.

3690621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3690619) and next prime (3690623).

It can be written as a sum of positive squares in only one way, i.e., 3663396 + 27225 = 1914^2 + 165^2 .

It is not a de Polignac number, because 3690621 - 2¹ = 3690619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3690623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 606 + ... + 2783.

Almost surely, 2^3690621 is an apocalyptic number.

It is an amenable number.

3690621 is a deficient number, since it is larger than the sum of its proper divisors (2170689).

3690621 is a wasteful number, since it uses less digits than its factorization.

3690621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417 (or 3403 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 3690621 is about 1921.0989042733. The cubic root of 3690621 is about 154.5372392718.

The spelling of 3690621 in words is "three million, six hundred ninety thousand, six hundred twenty-one".