1909401312 has 192 divisors, whose sum is σ = 6221021184. Its totient is φ = 499322880.

The previous prime is 1909401311. The next prime is 1909401337. The reversal of 1909401312 is 2131049091.

It is a self number, because there is not a number n which added to its sum of digits gives 1909401312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909401311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1108612 + ... + 1110332.

It is an arithmetic number, because the mean of its divisors is an integer number (32401152).

Almost surely, 2^1909401312 is an apocalyptic number.

1909401312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1909401312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3110510592).

1909401312 is an abundant number, since it is smaller than the sum of its proper divisors (4311619872).

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

1909401312 is a wasteful number, since it uses less digits than its factorization.

1909401312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1873 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1909401312 is about 43696.6968087978. The cubic root of 1909401312 is about 1240.6017959922.

The spelling of 1909401312 in words is "one billion, nine hundred nine million, four hundred one thousand, three hundred twelve".