197139915 has 48 divisors (see below), whose sum is σ = 411091200. Its totient is φ = 85375296.

The previous prime is 197139911. The next prime is 197139977. The reversal of 197139915 is 519931791.

It is a happy number.

197139915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197139915 - 2² = 197139911 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (197139911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10485 + ... + 22454.

It is an arithmetic number, because the mean of its divisors is an integer number (8564400).

Almost surely, 2^197139915 is an apocalyptic number.

197139915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

197139915 is an abundant number, since it is smaller than the sum of its proper divisors (213951285).

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

197139915 is a wasteful number, since it uses less digits than its factorization.

197139915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32976 (or 32973 counting only the distinct ones).

The product of its digits is 76545, while the sum is 45.

The square root of 197139915 is about 14040.6522284401. The cubic root of 197139915 is about 582.0025064546.

The spelling of 197139915 in words is "one hundred ninety-seven million, one hundred thirty-nine thousand, nine hundred fifteen".