1187849881 has 8 divisors (see below), whose sum is σ = 1240626240. Its totient is φ = 1135167792.

The previous prime is 1187849879. The next prime is 1187849917. The reversal of 1187849881 is 1889487811.

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 1187849881 - 2¹ = 1187849879 is a prime.

It is a super-2 number, since 2×1187849881² = 2821974679583428322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187849081) 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, 2835 + ... + 48823.

It is an arithmetic number, because the mean of its divisors is an integer number (155078280).

Almost surely, 2^1187849881 is an apocalyptic number.

It is an amenable number.

1187849881 is a deficient number, since it is larger than the sum of its proper divisors (52776359).

1187849881 is a wasteful number, since it uses less digits than its factorization.

1187849881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47135.

The product of its digits is 1032192, while the sum is 55.

The square root of 1187849881 is about 34465.1981134593. The cubic root of 1187849881 is about 1059.0598882505.

The spelling of 1187849881 in words is "one billion, one hundred eighty-seven million, eight hundred forty-nine thousand, eight hundred eighty-one".