197181390 has 96 divisors (see below), whose sum is σ = 568387584. Its totient is φ = 43606080.

The previous prime is 197181389. The next prime is 197181401. The reversal of 197181390 is 93181791.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 43407 + ... + 47733.

It is an arithmetic number, because the mean of its divisors is an integer number (5920704).

Almost surely, 2^197181390 is an apocalyptic number.

197181390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197181390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284193792).

197181390 is an abundant number, since it is smaller than the sum of its proper divisors (371206194).

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

197181390 is a wasteful number, since it uses less digits than its factorization.

197181390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382 (or 4375 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 197181390 is about 14042.1291120684. The cubic root of 197181390 is about 582.0433181820.

The spelling of 197181390 in words is "one hundred ninety-seven million, one hundred eighty-one thousand, three hundred ninety".