19907192387 has 2 divisors, whose sum is σ = 19907192388. Its totient is φ = 19907192386.

The previous prime is 19907192363. The next prime is 19907192429. The reversal of 19907192387 is 78329170991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19907192387 - 2¹² = 19907188291 is a prime.

It is not a weakly prime, because it can be changed into another prime (19907192087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9953596193 + 9953596194.

It is an arithmetic number, because the mean of its divisors is an integer number (9953596194).

Almost surely, 2^19907192387 is an apocalyptic number.

19907192387 is a deficient number, since it is larger than the sum of its proper divisors (1).

19907192387 is an equidigital number, since it uses as much as digits as its factorization.

19907192387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The spelling of 19907192387 in words is "nineteen billion, nine hundred seven million, one hundred ninety-two thousand, three hundred eighty-seven".