19540023 has 4 divisors (see below), whose sum is σ = 26053368. Its totient is φ = 13026680.

The previous prime is 19540007. The next prime is 19540043. The reversal of 19540023 is 32004591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19540023 - 2⁴ = 19540007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19539975 and 19540002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19540043) 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 3 ways as a sum of consecutive naturals, for example, 3256668 + ... + 3256673.

It is an arithmetic number, because the mean of its divisors is an integer number (6513342).

Almost surely, 2^19540023 is an apocalyptic number.

19540023 is a deficient number, since it is larger than the sum of its proper divisors (6513345).

19540023 is an equidigital number, since it uses as much as digits as its factorization.

19540023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6513344.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 19540023 is about 4420.4098226296. The cubic root of 19540023 is about 269.3446520434.

The spelling of 19540023 in words is "nineteen million, five hundred forty thousand, twenty-three".