1189142955 has 96 divisors (see below), whose sum is σ = 2767564800. Its totient is φ = 456157440.

The previous prime is 1189142951. The next prime is 1189143019. The reversal of 1189142955 is 5592419811.

It is not a de Polignac number, because 1189142955 - 2² = 1189142951 is a prime.

It is a super-2 number, since 2×1189142955² = 2828121934852264050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1189142955.

It is not an unprimeable number, because it can be changed into a prime (1189142951) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 31846 + ... + 58244.

It is an arithmetic number, because the mean of its divisors is an integer number (28828800).

Almost surely, 2^1189142955 is an apocalyptic number.

1189142955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1189142955 is an abundant number, since it is smaller than the sum of its proper divisors (1578421845).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1189142955 is a wasteful number, since it uses less digits than its factorization.

1189142955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26441 (or 26438 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1189142955 is about 34483.9521371898. The cubic root of 1189142955 is about 1059.4440406619. Note that the first 3 decimals are identical.

The spelling of 1189142955 in words is "one billion, one hundred eighty-nine million, one hundred forty-two thousand, nine hundred fifty-five".