3621405 has 16 divisors (see below), whose sum is σ = 5842944. Its totient is φ = 1915200.

The previous prime is 3621403. The next prime is 3621461. The reversal of 3621405 is 5041263.

It is a happy number.

3621405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3621405 - 2¹ = 3621403 is a prime.

It is a super-2 number, since 2×3621405² = 26229148348050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3621403) 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 15 ways as a sum of consecutive naturals, for example, 955 + ... + 2855.

It is an arithmetic number, because the mean of its divisors is an integer number (365184).

Almost surely, 2^3621405 is an apocalyptic number.

It is an amenable number.

3621405 is a deficient number, since it is larger than the sum of its proper divisors (2221539).

3621405 is a wasteful number, since it uses less digits than its factorization.

3621405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 3621405 is about 1902.9989490276. The cubic root of 3621405 is about 153.5650429754.

Adding to 3621405 its reverse (5041263), we get a palindrome (8662668).

The spelling of 3621405 in words is "three million, six hundred twenty-one thousand, four hundred five".