1909143 has 8 divisors (see below), whose sum is σ = 2828400. Its totient is φ = 1272744.

The previous prime is 1909129. The next prime is 1909147. The reversal of 1909143 is 3419091.

It is not a de Polignac number, because 1909143 - 2⁵ = 1909111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 70709 = 1909143 / (1 + 9 + 0 + 9 + 1 + 4 + 3).

1909143 is a lucky number.

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, 35328 + ... + 35381.

It is an arithmetic number, because the mean of its divisors is an integer number (353550).

2^1909143 is an apocalyptic number.

1909143 is a deficient number, since it is larger than the sum of its proper divisors (919257).

1909143 is an equidigital number, since it uses as much as digits as its factorization.

1909143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70718 (or 70712 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 1909143 is about 1381.7174096030. The cubic root of 1909143 is about 124.0545848825.

The spelling of 1909143 in words is "one million, nine hundred nine thousand, one hundred forty-three".