1187660993 has 8 divisors (see below), whose sum is σ = 1194446088. Its totient is φ = 1180893184.

The previous prime is 1187660939. The next prime is 1187661029. The reversal of 1187660993 is 3990667811.

It can be written as a sum of positive squares in 4 ways, for example, as 937768129 + 249892864 = 30623^2 + 15808^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1187660993 - 2²⁰ = 1186612417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187665993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148505 + ... + 156297.

It is an arithmetic number, because the mean of its divisors is an integer number (149305761).

Almost surely, 2^1187660993 is an apocalyptic number.

It is an amenable number.

1187660993 is a deficient number, since it is larger than the sum of its proper divisors (6785095).

1187660993 is an equidigital number, since it uses as much as digits as its factorization.

1187660993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8643.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1187660993 is about 34462.4577330172. The cubic root of 1187660993 is about 1059.0037491957.

The spelling of 1187660993 in words is "one billion, one hundred eighty-seven million, six hundred sixty thousand, nine hundred ninety-three".