1143932985 has 48 divisors (see below), whose sum is σ = 2209006800. Its totient is φ = 543739392.

The previous prime is 1143932983. The next prime is 1143932989. The reversal of 1143932985 is 5892393411.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 376864569 + 767068416 = 19413^2 + 27696^2 .

It is not a de Polignac number, because 1143932985 - 2¹ = 1143932983 is a prime.

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 1143932985.

It is not an unprimeable number, because it can be changed into a prime (1143932983) 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, 16750 + ... + 50679.

It is an arithmetic number, because the mean of its divisors is an integer number (46020975).

Almost surely, 2^1143932985 is an apocalyptic number.

1143932985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1143932985 is a deficient number, since it is larger than the sum of its proper divisors (1065073815).

1143932985 is a wasteful number, since it uses less digits than its factorization.

1143932985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67482 (or 67479 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 1143932985 is about 33822.0783660614. The cubic root of 1143932985 is about 1045.8438838672.

The spelling of 1143932985 in words is "one billion, one hundred forty-three million, nine hundred thirty-two thousand, nine hundred eighty-five".