1143978885 has 48 divisors (see below), whose sum is σ = 2385452160. Its totient is φ = 495434880.

The previous prime is 1143978883. The next prime is 1143978893. The reversal of 1143978885 is 5888793411.

1143978885 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1143978885 - 2¹ = 1143978883 is a prime.

It is a super-3 number, since 3×1143978885³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143978881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89586 + ... + 101555.

It is an arithmetic number, because the mean of its divisors is an integer number (49696920).

Almost surely, 2^1143978885 is an apocalyptic number.

1143978885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1143978885 is an abundant number, since it is smaller than the sum of its proper divisors (1241473275).

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

1143978885 is a wasteful number, since it uses less digits than its factorization.

1143978885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191178 (or 191175 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 1143978885 is about 33822.7569101042. The cubic root of 1143978885 is about 1045.8578717473.

The spelling of 1143978885 in words is "one billion, one hundred forty-three million, nine hundred seventy-eight thousand, eight hundred eighty-five".