197806490407 has 4 divisors (see below), whose sum is σ = 197813555640. Its totient is φ = 197799425176.

The previous prime is 197806490363. The next prime is 197806490471. The reversal of 197806490407 is 704094608791.

197806490407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197806490407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197806490107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3490453 + ... + 3546670.

It is an arithmetic number, because the mean of its divisors is an integer number (49453388910).

Almost surely, 2^197806490407 is an apocalyptic number.

197806490407 is a deficient number, since it is larger than the sum of its proper divisors (7065233).

197806490407 is an equidigital number, since it uses as much as digits as its factorization.

197806490407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065232.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 197806490407 in words is "one hundred ninety-seven billion, eight hundred six million, four hundred ninety thousand, four hundred seven".