1909389 has 16 divisors (see below), whose sum is σ = 2790720. Its totient is φ = 1155840.

The previous prime is 1909381. The next prime is 1909399. The reversal of 1909389 is 9839091.

It is not a de Polignac number, because 1909389 - 2³ = 1909381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909381) 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, 834 + ... + 2124.

It is an arithmetic number, because the mean of its divisors is an integer number (174420).

2^1909389 is an apocalyptic number.

It is an amenable number.

1909389 is a deficient number, since it is larger than the sum of its proper divisors (881331).

1909389 is a wasteful number, since it uses less digits than its factorization.

1909389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 1909389 is about 1381.8064263854. The cubic root of 1909389 is about 124.0599129481.

The spelling of 1909389 in words is "one million, nine hundred nine thousand, three hundred eighty-nine".