1187855045 has 8 divisors (see below), whose sum is σ = 1535074296. Its totient is φ = 877185216.

The previous prime is 1187855021. The next prime is 1187855047. The reversal of 1187855045 is 5405587811.

It can be written as a sum of positive squares in 4 ways, for example, as 61984129 + 1125870916 = 7873^2 + 33554^2 .

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 1187855045 - 2²² = 1183660741 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1187854987 and 1187855005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187855047) 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, 9137282 + ... + 9137411.

It is an arithmetic number, because the mean of its divisors is an integer number (191884287).

Almost surely, 2^1187855045 is an apocalyptic number.

It is an amenable number.

1187855045 is a deficient number, since it is larger than the sum of its proper divisors (347219251).

1187855045 is a wasteful number, since it uses less digits than its factorization.

1187855045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274711.

The product of its (nonzero) digits is 224000, while the sum is 44.

The square root of 1187855045 is about 34465.2730295293. The cubic root of 1187855045 is about 1059.0614229498.

The spelling of 1187855045 in words is "one billion, one hundred eighty-seven million, eight hundred fifty-five thousand, forty-five".