190868557 has 4 divisors (see below), whose sum is σ = 208220256. Its totient is φ = 173516860.

The previous prime is 190868521. The next prime is 190868563. The reversal of 190868557 is 755868091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 755868091 = 11 ⋅68715281.

It is not a de Polignac number, because 190868557 - 2⁷ = 190868429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 190868557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190868597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8675833 + ... + 8675854.

It is an arithmetic number, because the mean of its divisors is an integer number (52055064).

Almost surely, 2^190868557 is an apocalyptic number.

It is an amenable number.

190868557 is a deficient number, since it is larger than the sum of its proper divisors (17351699).

190868557 is a wasteful number, since it uses less digits than its factorization.

190868557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17351698.

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 190868557 is about 13815.5187018078. The cubic root of 190868557 is about 575.7643842870.

The spelling of 190868557 in words is "one hundred ninety million, eight hundred sixty-eight thousand, five hundred fifty-seven".