1923409509 has 16 divisors (see below), whose sum is σ = 2931671040. Its totient is φ = 1098805680.

The previous prime is 1923409493. The next prime is 1923409519. The reversal of 1923409509 is 9059043291.

It is not a de Polignac number, because 1923409509 - 2⁴ = 1923409493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1923409519) 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, 91972 + ... + 110930.

It is an arithmetic number, because the mean of its divisors is an integer number (183229440).

Almost surely, 2^1923409509 is an apocalyptic number.

It is an amenable number.

1923409509 is a deficient number, since it is larger than the sum of its proper divisors (1008261531).

1923409509 is a wasteful number, since it uses less digits than its factorization.

1923409509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23800.

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 1923409509 is about 43856.6928643736. The cubic root of 1923409509 is about 1243.6282712982.

The spelling of 1923409509 in words is "one billion, nine hundred twenty-three million, four hundred nine thousand, five hundred nine".