1909408746 has 64 divisors (see below), whose sum is σ = 4524060672. Its totient is φ = 525932352.

The previous prime is 1909408693. The next prime is 1909408789. The reversal of 1909408746 is 6478049091.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1909408695 and 1909408704.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125040 + ... + 139476.

It is an arithmetic number, because the mean of its divisors is an integer number (70688448).

Almost surely, 2^1909408746 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1909408746, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2262030336).

1909408746 is an abundant number, since it is smaller than the sum of its proper divisors (2614651926).

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

1909408746 is a wasteful number, since it uses less digits than its factorization.

1909408746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14563.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1909408746 is about 43696.7818723530. The cubic root of 1909408746 is about 1240.6034060294.

The spelling of 1909408746 in words is "one billion, nine hundred nine million, four hundred eight thousand, seven hundred forty-six".