19893974115 has 32 divisors (see below), whose sum is σ = 32521890816. Its totient is φ = 10379808000.

The previous prime is 19893974101. The next prime is 19893974119. The reversal of 19893974115 is 51147939891.

It is a happy number.

It is a Cunningham number, because it is equal to 141046²-1.

It is not a de Polignac number, because 19893974115 - 2⁴ = 19893974099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19893974119) 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 31 ways as a sum of consecutive naturals, for example, 2111004 + ... + 2120406.

It is an arithmetic number, because the mean of its divisors is an integer number (1016309088).

Almost surely, 2^19893974115 is an apocalyptic number.

19893974115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19893974115 is a deficient number, since it is larger than the sum of its proper divisors (12627916701).

19893974115 is a wasteful number, since it uses less digits than its factorization.

19893974115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12459.

The product of its digits is 2449440, while the sum is 57.

The spelling of 19893974115 in words is "nineteen billion, eight hundred ninety-three million, nine hundred seventy-four thousand, one hundred fifteen".