1187342643 has 4 divisors (see below), whose sum is σ = 1583123528. Its totient is φ = 791561760.

The previous prime is 1187342633. The next prime is 1187342659. The reversal of 1187342643 is 3462437811.

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

It is not a de Polignac number, because 1187342643 - 2⁴ = 1187342627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187342633) 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, 197890438 + ... + 197890443.

It is an arithmetic number, because the mean of its divisors is an integer number (395780882).

Almost surely, 2^1187342643 is an apocalyptic number.

1187342643 is a deficient number, since it is larger than the sum of its proper divisors (395780885).

1187342643 is an equidigital number, since it uses as much as digits as its factorization.

1187342643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395780884.

The product of its digits is 96768, while the sum is 39.

The square root of 1187342643 is about 34457.8386292582. The cubic root of 1187342643 is about 1058.9091195069.

The spelling of 1187342643 in words is "one billion, one hundred eighty-seven million, three hundred forty-two thousand, six hundred forty-three".