1115389890 has 96 divisors (see below), whose sum is σ = 3078247536. Its totient is φ = 279244800.

The previous prime is 1115389883. The next prime is 1115389897. The reversal of 1115389890 is 989835111.

It is an interprime number because it is at equal distance from previous prime (1115389883) and next prime (1115389897).

It can be written as a sum of positive squares in 8 ways, for example, as 527666841 + 587723049 = 22971^2 + 24243^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1115389897) 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, 918924 + ... + 920136.

Almost surely, 2^1115389890 is an apocalyptic number.

1115389890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1115389890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1539123768).

1115389890 is an abundant number, since it is smaller than the sum of its proper divisors (1962857646).

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

1115389890 is a wasteful number, since it uses less digits than its factorization.

1115389890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844 (or 1841 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 45.

The square root of 1115389890 is about 33397.4533460263. The cubic root of 1115389890 is about 1037.0719817664.

The spelling of 1115389890 in words is "one billion, one hundred fifteen million, three hundred eighty-nine thousand, eight hundred ninety".