1909459394 has 8 divisors (see below), whose sum is σ = 2903424780. Its totient is φ = 941651136.

The previous prime is 1909459381. The next prime is 1909459399. The reversal of 1909459394 is 4939549091.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1833124225 + 76335169 = 42815^2 + 8737^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1909459399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6539099 + ... + 6539390.

Almost surely, 2^1909459394 is an apocalyptic number.

1909459394 is a deficient number, since it is larger than the sum of its proper divisors (993965386).

1909459394 is a wasteful number, since it uses less digits than its factorization.

1909459394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13078564.

The product of its (nonzero) digits is 1574640, while the sum is 53.

The square root of 1909459394 is about 43697.3614077555. The cubic root of 1909459394 is about 1240.6143751363.

The spelling of 1909459394 in words is "one billion, nine hundred nine million, four hundred fifty-nine thousand, three hundred ninety-four".