197890505 has 8 divisors (see below), whose sum is σ = 247793472. Its totient is φ = 151429168.

The previous prime is 197890487. The next prime is 197890507. The reversal of 197890505 is 505098791.

It is a happy number.

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 197890505 - 2⁸ = 197890249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (197890507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860279 + ... + 860508.

It is an arithmetic number, because the mean of its divisors is an integer number (30974184).

Almost surely, 2^197890505 is an apocalyptic number.

It is an amenable number.

197890505 is a deficient number, since it is larger than the sum of its proper divisors (49902967).

197890505 is a wasteful number, since it uses less digits than its factorization.

197890505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720815.

The product of its (nonzero) digits is 113400, while the sum is 44.

The square root of 197890505 is about 14067.3560060162. The cubic root of 197890505 is about 582.7402092795.

The spelling of 197890505 in words is "one hundred ninety-seven million, eight hundred ninety thousand, five hundred five".