1186870491 has 12 divisors (see below), whose sum is σ = 1743426360. Its totient is φ = 777835680.

The previous prime is 1186870471. The next prime is 1186870513. The reversal of 1186870491 is 1940786811.

It is a happy number.

1186870491 is a `hidden beast` number, since 1 + 1 + 86 + 87 + 0 + 491 = 666.

It is not a de Polignac number, because 1186870491 - 2¹¹ = 1186868443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1186870471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1117050 + ... + 1118111.

It is an arithmetic number, because the mean of its divisors is an integer number (145285530).

Almost surely, 2^1186870491 is an apocalyptic number.

1186870491 is a deficient number, since it is larger than the sum of its proper divisors (556555869).

1186870491 is a wasteful number, since it uses less digits than its factorization.

1186870491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235226 (or 2235223 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 1186870491 is about 34450.9867928337. The cubic root of 1186870491 is about 1058.7687409488.

The spelling of 1186870491 in words is "one billion, one hundred eighty-six million, eight hundred seventy thousand, four hundred ninety-one".