189970817 has 4 divisors (see below), whose sum is σ = 190100400. Its totient is φ = 189841236.

The previous prime is 189970783. The next prime is 189970819. The reversal of 189970817 is 718079981.

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.

It is a cyclic number.

It is not a de Polignac number, because 189970817 - 2¹⁶ = 189905281 is a prime.

It is a super-2 number, since 2×189970817² = 72177822623294978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189970819) 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, 62567 + ... + 65532.

It is an arithmetic number, because the mean of its divisors is an integer number (47525100).

Almost surely, 2^189970817 is an apocalyptic number.

It is an amenable number.

189970817 is a deficient number, since it is larger than the sum of its proper divisors (129583).

189970817 is a wasteful number, since it uses less digits than its factorization.

189970817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129582.

The product of its (nonzero) digits is 254016, while the sum is 50.

The square root of 189970817 is about 13782.9901327687. The cubic root of 189970817 is about 574.8602730430.

The spelling of 189970817 in words is "one hundred eighty-nine million, nine hundred seventy thousand, eight hundred seventeen".