197438905 has 8 divisors (see below), whose sum is σ = 237040200. Its totient is φ = 157875456.

The previous prime is 197438881. The next prime is 197438951. The reversal of 197438905 is 509834791.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31956409 + 165482496 = 5653^2 + 12864^2 .

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 197438905 - 2⁷ = 197438777 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3681 + ... + 20209.

It is an arithmetic number, because the mean of its divisors is an integer number (29630025).

Almost surely, 2^197438905 is an apocalyptic number.

It is an amenable number.

197438905 is a deficient number, since it is larger than the sum of its proper divisors (39601295).

197438905 is a wasteful number, since it uses less digits than its factorization.

197438905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18923.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 197438905 is about 14051.2954918755. The cubic root of 197438905 is about 582.2965869843.

The spelling of 197438905 in words is "one hundred ninety-seven million, four hundred thirty-eight thousand, nine hundred five".