3621861 has 16 divisors (see below), whose sum is σ = 5469120. Its totient is φ = 2368080.

The previous prime is 3621857. The next prime is 3621881. The reversal of 3621861 is 1681263.

It is not a de Polignac number, because 3621861 - 2² = 3621857 is a prime.

It is a super-3 number, since 3×3621861³ (a number of 21 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166 + ... + 2696.

It is an arithmetic number, because the mean of its divisors is an integer number (341820).

Almost surely, 2^3621861 is an apocalyptic number.

It is an amenable number.

3621861 is a deficient number, since it is larger than the sum of its proper divisors (1847259).

3621861 is a wasteful number, since it uses less digits than its factorization.

3621861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593 (or 2587 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 3621861 is about 1903.1187561474. The cubic root of 3621861 is about 153.5714882381.

The spelling of 3621861 in words is "three million, six hundred twenty-one thousand, eight hundred sixty-one".