197729478 has 32 divisors (see below), whose sum is σ = 440575200. Its totient is φ = 65733408.

The previous prime is 197729471. The next prime is 197729509. The reversal of 197729478 is 874927791.

197729478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197729471) 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, 16300 + ... + 25712.

It is an arithmetic number, because the mean of its divisors is an integer number (13767975).

Almost surely, 2^197729478 is an apocalyptic number.

197729478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

197729478 is an abundant number, since it is smaller than the sum of its proper divisors (242845722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197729478 is a wasteful number, since it uses less digits than its factorization.

197729478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9813 (or 9807 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 197729478 is about 14061.6314131754. The cubic root of 197729478 is about 582.5821043863.

The spelling of 197729478 in words is "one hundred ninety-seven million, seven hundred twenty-nine thousand, four hundred seventy-eight".