190018897 has 4 divisors (see below), whose sum is σ = 190053540. Its totient is φ = 189984256.

The previous prime is 190018883. The next prime is 190018903. The reversal of 190018897 is 798810091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798810091 = 433 ⋅1844827.

It can be written as a sum of positive squares in 2 ways, for example, as 75186241 + 114832656 = 8671^2 + 10716^2 .

It is a cyclic number.

It is not a de Polignac number, because 190018897 - 2⁷ = 190018769 is a prime.

It is a super-2 number, since 2×190018897² = 72214362434193218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190018597) 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, 7072 + ... + 20737.

It is an arithmetic number, because the mean of its divisors is an integer number (47513385).

Almost surely, 2^190018897 is an apocalyptic number.

It is an amenable number.

190018897 is a deficient number, since it is larger than the sum of its proper divisors (34643).

190018897 is an equidigital number, since it uses as much as digits as its factorization.

190018897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34642.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 190018897 is about 13784.7342012822. The cubic root of 190018897 is about 574.9087663693.

The spelling of 190018897 in words is "one hundred ninety million, eighteen thousand, eight hundred ninety-seven".