190790945 has 4 divisors (see below), whose sum is σ = 228949140. Its totient is φ = 152632752.

The previous prime is 190790939. The next prime is 190790947. The reversal of 190790945 is 549097091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549097091 = 19157 ⋅28663.

It can be written as a sum of positive squares in 2 ways, for example, as 105431824 + 85359121 = 10268^2 + 9239^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190790945 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 190790896 and 190790905.

It is not an unprimeable number, because it can be changed into a prime (190790947) 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, 19079090 + ... + 19079099.

It is an arithmetic number, because the mean of its divisors is an integer number (57237285).

Almost surely, 2^190790945 is an apocalyptic number.

It is an amenable number.

190790945 is a deficient number, since it is larger than the sum of its proper divisors (38158195).

190790945 is an equidigital number, since it uses as much as digits as its factorization.

190790945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38158194.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 190790945 is about 13812.7095459218. The cubic root of 190790945 is about 575.6863335692.

The spelling of 190790945 in words is "one hundred ninety million, seven hundred ninety thousand, nine hundred forty-five".