3621218 has 4 divisors (see below), whose sum is σ = 5431830. Its totient is φ = 1810608.

The previous prime is 3621217. The next prime is 3621223. The reversal of 3621218 is 8121263.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8121263 = 109 ⋅74507.

It can be written as a sum of positive squares in only one way, i.e., 2666689 + 954529 = 1633^2 + 977^2 .

It is a super-2 number, since 2×3621218² = 26226439607048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3621193 and 3621202.

It is not an unprimeable number, because it can be changed into a prime (3621217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 905303 + ... + 905306.

Almost surely, 2^3621218 is an apocalyptic number.

3621218 is a deficient number, since it is larger than the sum of its proper divisors (1810612).

3621218 is a wasteful number, since it uses less digits than its factorization.

3621218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810611.

The product of its digits is 576, while the sum is 23.

The square root of 3621218 is about 1902.9498154182. The cubic root of 3621218 is about 153.5623996958.

The spelling of 3621218 in words is "three million, six hundred twenty-one thousand, two hundred eighteen".