1909389213 has 16 divisors (see below), whose sum is σ = 2855165760. Its totient is φ = 1261027728.

The previous prime is 1909389199. The next prime is 1909389217. The reversal of 1909389213 is 3129839091.

It is a happy number.

It is not a de Polignac number, because 1909389213 - 2⁴ = 1909389197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909389217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327570 + ... + 333347.

It is an arithmetic number, because the mean of its divisors is an integer number (178447860).

Almost surely, 2^1909389213 is an apocalyptic number.

It is an amenable number.

1909389213 is a deficient number, since it is larger than the sum of its proper divisors (945776547).

1909389213 is a wasteful number, since it uses less digits than its factorization.

1909389213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661033 (or 661027 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 1909389213 is about 43696.5583656196. The cubic root of 1909389213 is about 1240.5991756119.

The spelling of 1909389213 in words is "one billion, nine hundred nine million, three hundred eighty-nine thousand, two hundred thirteen".