1115431878 has 16 divisors (see below), whose sum is σ = 2433669696. Its totient is φ = 338009640.

The previous prime is 1115431873. The next prime is 1115431883. The reversal of 1115431878 is 8781345111.

It is an interprime number because it is at equal distance from previous prime (1115431873) and next prime (1115431883).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115431873) 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, 8450176 + ... + 8450307.

It is an arithmetic number, because the mean of its divisors is an integer number (152104356).

Almost surely, 2^1115431878 is an apocalyptic number.

1115431878 is an abundant number, since it is smaller than the sum of its proper divisors (1318237818).

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

1115431878 is a wasteful number, since it uses less digits than its factorization.

1115431878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16900499.

The product of its digits is 26880, while the sum is 39.

The square root of 1115431878 is about 33398.0819509145. The cubic root of 1115431878 is about 1037.0849948638.

Adding to 1115431878 its reverse (8781345111), we get a palindrome (9896776989).

The spelling of 1115431878 in words is "one billion, one hundred fifteen million, four hundred thirty-one thousand, eight hundred seventy-eight".