3631554 has 40 divisors (see below), whose sum is σ = 8428860. Its totient is φ = 1167264.

The previous prime is 3631543. The next prime is 3631561. The reversal of 3631554 is 4551363.

It can be written as a sum of positive squares in 2 ways, for example, as 3404025 + 227529 = 1845^2 + 477^2 .

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4312 + ... + 5084.

Almost surely, 2^3631554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3631554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4214430).

3631554 is an abundant number, since it is smaller than the sum of its proper divisors (4797306).

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

3631554 is a wasteful number, since it uses less digits than its factorization.

3631554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 807 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 3631554 is about 1905.6636639239. The cubic root of 3631554 is about 153.7083646929.

The spelling of 3631554 in words is "three million, six hundred thirty-one thousand, five hundred fifty-four".