1115821478 has 8 divisors (see below), whose sum is σ = 1714555080. Its totient is φ = 544303120.

The previous prime is 1115821439. The next prime is 1115821513. The reversal of 1115821478 is 8741285111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1115821478² = 2490115141532208968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6803708 + ... + 6803871.

It is an arithmetic number, because the mean of its divisors is an integer number (214319385).

Almost surely, 2^1115821478 is an apocalyptic number.

1115821478 is a deficient number, since it is larger than the sum of its proper divisors (598733602).

1115821478 is a wasteful number, since it uses less digits than its factorization.

1115821478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13607622.

The product of its digits is 17920, while the sum is 38.

The square root of 1115821478 is about 33403.9141119720. The cubic root of 1115821478 is about 1037.2057257630.

The spelling of 1115821478 in words is "one billion, one hundred fifteen million, eight hundred twenty-one thousand, four hundred seventy-eight".