1215855424 has 112 divisors (see below), whose sum is σ = 2847644800. Its totient is φ = 514805760.

The previous prime is 1215855413. The next prime is 1215855437. The reversal of 1215855424 is 4245585121.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2129059 + ... + 2129629.

It is an arithmetic number, because the mean of its divisors is an integer number (25425400).

Almost surely, 2^1215855424 is an apocalyptic number.

1215855424 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1215855424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423822400).

1215855424 is an abundant number, since it is smaller than the sum of its proper divisors (1631789376).

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

1215855424 is an frugal number, since it uses more digits than its factorization.

1215855424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 677 counting only the distinct ones).

The product of its digits is 64000, while the sum is 37.

The square root of 1215855424 is about 34869.1184861333. The cubic root of 1215855424 is about 1067.3183566240.

The spelling of 1215855424 in words is "one billion, two hundred fifteen million, eight hundred fifty-five thousand, four hundred twenty-four".