3691408 has 40 divisors (see below), whose sum is σ = 8535168. Its totient is φ = 1512192.

The previous prime is 3691403. The next prime is 3691447. The reversal of 3691408 is 8041963.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3691408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3691403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1860 + ... + 3292.

Almost surely, 2^3691408 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 3691408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4267584).

3691408 is an abundant number, since it is smaller than the sum of its proper divisors (4843760).

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

3691408 is a wasteful number, since it uses less digits than its factorization.

3691408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471 (or 1465 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 3691408 is about 1921.3037240374. The cubic root of 3691408 is about 154.5482231652.

The spelling of 3691408 in words is "three million, six hundred ninety-one thousand, four hundred eight".