1187405987018 has 4 divisors (see below), whose sum is σ = 1781108980530. Its totient is φ = 593702993508.

The previous prime is 1187405986969. The next prime is 1187405987029. The reversal of 1187405987018 is 8107895047811.

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

It can be written as a sum of positive squares in only one way, i.e., 1108718443849 + 78687543169 = 1052957^2 + 280513^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 296851496753 + ... + 296851496756.

Almost surely, 2^{1187405987018} is an apocalyptic number.

1187405987018 is a deficient number, since it is larger than the sum of its proper divisors (593702993512).

1187405987018 is an equidigital number, since it uses as much as digits as its factorization.

1187405987018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593702993511.

The product of its (nonzero) digits is 4515840, while the sum is 59.

The spelling of 1187405987018 in words is "one trillion, one hundred eighty-seven billion, four hundred five million, nine hundred eighty-seven thousand, eighteen".