197402491 has 32 divisors (see below), whose sum is σ = 247339008. Its totient is φ = 154957440.

The previous prime is 197402483. The next prime is 197402503. The reversal of 197402491 is 194204791.

It is not a de Polignac number, because 197402491 - 2³ = 197402483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197402491.

It is not an unprimeable number, because it can be changed into a prime (197402411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153945 + ... + 155221.

It is an arithmetic number, because the mean of its divisors is an integer number (7729344).

Almost surely, 2^197402491 is an apocalyptic number.

197402491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

197402491 is a deficient number, since it is larger than the sum of its proper divisors (49936517).

197402491 is a wasteful number, since it uses less digits than its factorization.

197402491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 197402491 is about 14049.9996797153. Note that the first 3 decimals coincide. The cubic root of 197402491 is about 582.2607867932.

The spelling of 197402491 in words is "one hundred ninety-seven million, four hundred two thousand, four hundred ninety-one".