197720457 has 16 divisors (see below), whose sum is σ = 289505280. Its totient is φ = 119034000.

The previous prime is 197720437. The next prime is 197720461. The reversal of 197720457 is 754027791.

It is not a de Polignac number, because 197720457 - 2⁷ = 197720329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (197720437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14857 + ... + 24822.

It is an arithmetic number, because the mean of its divisors is an integer number (18094080).

Almost surely, 2^197720457 is an apocalyptic number.

It is an amenable number.

197720457 is a deficient number, since it is larger than the sum of its proper divisors (91784823).

197720457 is a wasteful number, since it uses less digits than its factorization.

197720457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39844.

The product of its (nonzero) digits is 123480, while the sum is 42.

The square root of 197720457 is about 14061.3106430375. The cubic root of 197720457 is about 582.5732445489.

The spelling of 197720457 in words is "one hundred ninety-seven million, seven hundred twenty thousand, four hundred fifty-seven".