1868867197 has 4 divisors (see below), whose sum is σ = 1868954560. Its totient is φ = 1868779836.

The previous prime is 1868867191. The next prime is 1868867257. The reversal of 1868867197 is 7917688681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1868867197 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 (1868867191) 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, 12454 + ... + 62392.

It is an arithmetic number, because the mean of its divisors is an integer number (467238640).

Almost surely, 2^1868867197 is an apocalyptic number.

It is an amenable number.

1868867197 is a deficient number, since it is larger than the sum of its proper divisors (87363).

1868867197 is an equidigital number, since it uses as much as digits as its factorization.

1868867197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87362.

The product of its digits is 8128512, while the sum is 61.

The square root of 1868867197 is about 43230.3966787260. The cubic root of 1868867197 is about 1231.7601426729.

The spelling of 1868867197 in words is "one billion, eight hundred sixty-eight million, eight hundred sixty-seven thousand, one hundred ninety-seven".