197780145 has 32 divisors (see below), whose sum is σ = 328648320. Its totient is φ = 101445120.

The previous prime is 197780137. The next prime is 197780179. The reversal of 197780145 is 541087791.

It is not a de Polignac number, because 197780145 - 2³ = 197780137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197780097 and 197780106.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132805 + ... + 134285.

It is an arithmetic number, because the mean of its divisors is an integer number (10270260).

Almost surely, 2^197780145 is an apocalyptic number.

197780145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197780145 is a deficient number, since it is larger than the sum of its proper divisors (130868175).

197780145 is a wasteful number, since it uses less digits than its factorization.

197780145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 197780145 is about 14063.4329023891. The cubic root of 197780145 is about 582.6318612004.

The spelling of 197780145 in words is "one hundred ninety-seven million, seven hundred eighty thousand, one hundred forty-five".