19540099 has 4 divisors (see below), whose sum is σ = 19618200. Its totient is φ = 19462000.

The previous prime is 19540061. The next prime is 19540121. The reversal of 19540099 is 99004591.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19540099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19540399) 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, 38674 + ... + 39175.

It is an arithmetic number, because the mean of its divisors is an integer number (4904550).

Almost surely, 2^19540099 is an apocalyptic number.

19540099 is a deficient number, since it is larger than the sum of its proper divisors (78101).

19540099 is an equidigital number, since it uses as much as digits as its factorization.

19540099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78100.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 19540099 is about 4420.4184191092. The cubic root of 19540099 is about 269.3450012441.

The spelling of 19540099 in words is "nineteen million, five hundred forty thousand, ninety-nine".