197778043 has 4 divisors (see below), whose sum is σ = 201020368. Its totient is φ = 194535720.

The previous prime is 197778041. The next prime is 197778059. The reversal of 197778043 is 340877791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 340877791 = 739 ⋅461269.

It is a cyclic number.

It is not a de Polignac number, because 197778043 - 2¹ = 197778041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197777984 and 197778002.

It is not an unprimeable number, because it can be changed into a prime (197778041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1621071 + ... + 1621192.

It is an arithmetic number, because the mean of its divisors is an integer number (50255092).

Almost surely, 2^197778043 is an apocalyptic number.

197778043 is a deficient number, since it is larger than the sum of its proper divisors (3242325).

197778043 is an equidigital number, since it uses as much as digits as its factorization.

197778043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242324.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 197778043 is about 14063.3581693705. The cubic root of 197778043 is about 582.6297971298.

The spelling of 197778043 in words is "one hundred ninety-seven million, seven hundred seventy-eight thousand, forty-three".