190640785 has 4 divisors (see below), whose sum is σ = 228768948. Its totient is φ = 152512624.

The previous prime is 190640783. The next prime is 190640819. The reversal of 190640785 is 587046091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 587046091 = 17 ⋅34532123.

It can be written as a sum of positive squares in 2 ways, for example, as 38093584 + 152547201 = 6172^2 + 12351^2 .

It is a cyclic number.

It is not a de Polignac number, because 190640785 - 2¹ = 190640783 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190640783) 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, 19064074 + ... + 19064083.

It is an arithmetic number, because the mean of its divisors is an integer number (57192237).

Almost surely, 2^190640785 is an apocalyptic number.

It is an amenable number.

190640785 is a deficient number, since it is larger than the sum of its proper divisors (38128163).

190640785 is an equidigital number, since it uses as much as digits as its factorization.

190640785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38128162.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 190640785 is about 13807.2729023511. The cubic root of 190640785 is about 575.5352646452.

The spelling of 190640785 in words is "one hundred ninety million, six hundred forty thousand, seven hundred eighty-five".