1909499904 has 216 divisors, whose sum is σ = 5981591070. Its totient is φ = 586579968.

The previous prime is 1909499869. The next prime is 1909499941. The reversal of 1909499904 is 4099949091.

It can be written as a sum of positive squares in 3 ways, for example, as 322274304 + 1587225600 = 17952^2 + 39840^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3114702 + ... + 3115314.

Almost surely, 2^1909499904 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 1909499904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2990795535).

1909499904 is an abundant number, since it is smaller than the sum of its proper divisors (4072091166).

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

1909499904 is a wasteful number, since it uses less digits than its factorization.

1909499904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 1909499904 is about 43697.8249344289. The cubic root of 1909499904 is about 1240.6231484630.

The spelling of 1909499904 in words is "one billion, nine hundred nine million, four hundred ninety-nine thousand, nine hundred four".