19138890815 has 16 divisors (see below), whose sum is σ = 25665637536. Its totient is φ = 13579699200.

The previous prime is 19138890809. The next prime is 19138890833. The reversal of 19138890815 is 51809883191.

It is a happy number.

It is not a de Polignac number, because 19138890815 - 2³² = 14843923519 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4241402 + ... + 4245911.

It is an arithmetic number, because the mean of its divisors is an integer number (1604102346).

Almost surely, 2^19138890815 is an apocalyptic number.

19138890815 is a deficient number, since it is larger than the sum of its proper divisors (6526746721).

19138890815 is a wasteful number, since it uses less digits than its factorization.

19138890815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8487370.

The product of its (nonzero) digits is 622080, while the sum is 53.

The spelling of 19138890815 in words is "nineteen billion, one hundred thirty-eight million, eight hundred ninety thousand, eight hundred fifteen".