1909047023 has 4 divisors (see below), whose sum is σ = 2055896808. Its totient is φ = 1762197240.

The previous prime is 1909046981. The next prime is 1909047029. The reversal of 1909047023 is 3207409091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3207409091 = 17 ⋅188671123.

It is a cyclic number.

It is not a de Polignac number, because 1909047023 - 2¹⁸ = 1908784879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909047029) 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, 73424873 + ... + 73424898.

It is an arithmetic number, because the mean of its divisors is an integer number (513974202).

Almost surely, 2^1909047023 is an apocalyptic number.

1909047023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1909047023 is a deficient number, since it is larger than the sum of its proper divisors (146849785).

1909047023 is a wasteful number, since it uses less digits than its factorization.

1909047023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146849784.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 1909047023 is about 43692.6426644120. The cubic root of 1909047023 is about 1240.5250601143.

The spelling of 1909047023 in words is "one billion, nine hundred nine million, forty-seven thousand, twenty-three".