190699840987 has 4 divisors (see below), whose sum is σ = 192155565096. Its totient is φ = 189244116880.

The previous prime is 190699840967. The next prime is 190699840993. The reversal of 190699840987 is 789048996091.

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-190699840987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190699840967) 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, 727861858 + ... + 727862119.

It is an arithmetic number, because the mean of its divisors is an integer number (48038891274).

Almost surely, 2^190699840987 is an apocalyptic number.

190699840987 is a deficient number, since it is larger than the sum of its proper divisors (1455724109).

190699840987 is a wasteful number, since it uses less digits than its factorization.

190699840987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455724108.

The product of its (nonzero) digits is 70543872, while the sum is 70.

The spelling of 190699840987 in words is "one hundred ninety billion, six hundred ninety-nine million, eight hundred forty thousand, nine hundred eighty-seven".