197806158 has 64 divisors (see below), whose sum is σ = 496108800. Its totient is φ = 57869280.

The previous prime is 197806139. The next prime is 197806159. The reversal of 197806158 is 851608791.

It is a super-2 number, since 2×197806158² = 78254552285441928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197806159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11485 + ... + 22967.

It is an arithmetic number, because the mean of its divisors is an integer number (7751700).

Almost surely, 2^197806158 is an apocalyptic number.

197806158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197806158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248054400).

197806158 is an abundant number, since it is smaller than the sum of its proper divisors (298302642).

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

197806158 is a wasteful number, since it uses less digits than its factorization.

197806158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11534 (or 11528 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The square root of 197806158 is about 14064.3577172937. The cubic root of 197806158 is about 582.6574035995.

The spelling of 197806158 in words is "one hundred ninety-seven million, eight hundred six thousand, one hundred fifty-eight".