1909149 has 8 divisors (see below), whose sum is σ = 2776992. Its totient is φ = 1157040.

The previous prime is 1909147. The next prime is 1909153. The reversal of 1909149 is 9419091.

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

It is not a de Polignac number, because 1909149 - 2¹ = 1909147 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 57853 = 1909149 / (1 + 9 + 0 + 9 + 1 + 4 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28894 + ... + 28959.

It is an arithmetic number, because the mean of its divisors is an integer number (347124).

2^1909149 is an apocalyptic number.

It is an amenable number.

1909149 is a deficient number, since it is larger than the sum of its proper divisors (867843).

1909149 is a wasteful number, since it uses less digits than its factorization.

1909149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57867.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 1909149 is about 1381.7195808123. The cubic root of 1909149 is about 124.0547148408.

It can be divided in two parts, 190 and 9149, that added together give a palindrome (9339).

The spelling of 1909149 in words is "one million, nine hundred nine thousand, one hundred forty-nine".