19491600039 has 16 divisors (see below), whose sum is σ = 26886281184. Its totient is φ = 12551936000.

The previous prime is 19491600017. The next prime is 19491600041. The reversal of 19491600039 is 93000619491.

It is a cyclic number.

It is not a de Polignac number, because 19491600039 - 2²¹ = 19489502887 is a prime.

It is a super-3 number, since 3×19491600039³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19491600059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772074 + ... + 796919.

It is an arithmetic number, because the mean of its divisors is an integer number (1680392574).

Almost surely, 2^19491600039 is an apocalyptic number.

19491600039 is a deficient number, since it is larger than the sum of its proper divisors (7394681145).

19491600039 is a wasteful number, since it uses less digits than its factorization.

19491600039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1569138.

The product of its (nonzero) digits is 52488, while the sum is 42.

The spelling of 19491600039 in words is "nineteen billion, four hundred ninety-one million, six hundred thousand, thirty-nine".