190786157 has 8 divisors (see below), whose sum is σ = 200070840. Its totient is φ = 181681920.

The previous prime is 190786151. The next prime is 190786181. The reversal of 190786157 is 751687091.

It can be written as a sum of positive squares in 4 ways, for example, as 97199881 + 93586276 = 9859^2 + 9674^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 190786157 - 2⁶ = 190786093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190786151) 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 7 ways as a sum of consecutive naturals, for example, 42944 + ... + 47177.

It is an arithmetic number, because the mean of its divisors is an integer number (25008855).

Almost surely, 2^190786157 is an apocalyptic number.

It is an amenable number.

190786157 is a deficient number, since it is larger than the sum of its proper divisors (9284683).

190786157 is an equidigital number, since it uses as much as digits as its factorization.

190786157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90223.

The product of its (nonzero) digits is 105840, while the sum is 44.

The square root of 190786157 is about 13812.5362261968. The cubic root of 190786157 is about 575.6815178109.

The spelling of 190786157 in words is "one hundred ninety million, seven hundred eighty-six thousand, one hundred fifty-seven".