1188420671 has 4 divisors (see below), whose sum is σ = 1196970600. Its totient is φ = 1179870744.

The previous prime is 1188420647. The next prime is 1188420677. The reversal of 1188420671 is 1760248811.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1188420671 - 2¹⁸ = 1188158527 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 (1188420677) 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, 4274756 + ... + 4275033.

It is an arithmetic number, because the mean of its divisors is an integer number (299242650).

Almost surely, 2^1188420671 is an apocalyptic number.

1188420671 is a deficient number, since it is larger than the sum of its proper divisors (8549929).

1188420671 is an equidigital number, since it uses as much as digits as its factorization.

1188420671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8549928.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 1188420671 is about 34473.4777909047. The cubic root of 1188420671 is about 1059.2294955394.

The spelling of 1188420671 in words is "one billion, one hundred eighty-eight million, four hundred twenty thousand, six hundred seventy-one".