3621408 has 96 divisors (see below), whose sum is σ = 11539584. Its totient is φ = 970752.

The previous prime is 3621403. The next prime is 3621461. The reversal of 3621408 is 8041263.

It is a happy number.

It is a Cunningham number, because it is equal to 1903²-1.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×3621408² = 26229191804928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (3621403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11266 + ... + 11582.

It is an arithmetic number, because the mean of its divisors is an integer number (120204).

Almost surely, 2^3621408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3621408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5769792).

3621408 is an abundant number, since it is smaller than the sum of its proper divisors (7918176).

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

3621408 is a wasteful number, since it uses less digits than its factorization.

3621408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 3621408 is about 1902.9997372569. Note that the first 3 decimals coincide. The cubic root of 3621408 is about 153.5650853802.

It can be divided in two parts, 362 and 1408, that added together give a triangular number (1770 = T₅₉).

The spelling of 3621408 in words is "three million, six hundred twenty-one thousand, four hundred eight".