3609439900 has 72 divisors (see below), whose sum is σ = 8554702464. Its totient is φ = 1310961600.

The previous prime is 3609439859. The next prime is 3609439919. The reversal of 3609439900 is 99349063.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1343959 + ... + 1346641.

It is an arithmetic number, because the mean of its divisors is an integer number (118815312).

Almost surely, 2^3609439900 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 3609439900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4277351232).

3609439900 is an abundant number, since it is smaller than the sum of its proper divisors (4945262564).

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

3609439900 is a wasteful number, since it uses less digits than its factorization.

3609439900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931 (or 3924 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 3609439900 is about 60078.6143315573. The cubic root of 3609439900 is about 1533.9573038097.

The spelling of 3609439900 in words is "three billion, six hundred nine million, four hundred thirty-nine thousand, nine hundred".