3721626 has 20 divisors (see below), whose sum is σ = 8339562. Its totient is φ = 1240488.

The previous prime is 3721621. The next prime is 3721631. The reversal of 3721626 is 6261273.

It is a happy number.

3721626 is a `hidden beast` number, since 37 + 2 + 1 + 626 = 666.

3721626 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 (3721621) and next prime (3721631).

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 641601 = 1755^2 + 801^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 3721626.

It is not an unprimeable number, because it can be changed into a prime (3721621) 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 9 ways as a sum of consecutive naturals, for example, 11325 + ... + 11648.

Almost surely, 2^3721626 is an apocalyptic number.

3721626 is an abundant number, since it is smaller than the sum of its proper divisors (4617936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3721626 is a wasteful number, since it uses less digits than its factorization.

3721626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22987 (or 22978 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 3721626 is about 1929.1516270112. The cubic root of 3721626 is about 154.9687901088.

Adding to 3721626 its reverse (6261273), we get a palindrome (9982899).

The spelling of 3721626 in words is "three million, seven hundred twenty-one thousand, six hundred twenty-six".