1215773460 has 144 divisors (see below), whose sum is σ = 4049764992. Its totient is φ = 292780800.

The previous prime is 1215773401. The next prime is 1215773509. The reversal of 1215773460 is 643775121.

It is a happy number.

1215773460 is a `hidden beast` number, since 1 + 21 + 577 + 3 + 4 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 308905 + ... + 312815.

It is an arithmetic number, because the mean of its divisors is an integer number (28123368).

Almost surely, 2^1215773460 is an apocalyptic number.

1215773460 is a gapful number since it is divisible by the number (10) 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 1215773460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2024882496).

1215773460 is an abundant number, since it is smaller than the sum of its proper divisors (2833991532).

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

1215773460 is a wasteful number, since it uses less digits than its factorization.

1215773460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4094 (or 4089 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1215773460 is about 34867.9431570031. The cubic root of 1215773460 is about 1067.2943725093.

The spelling of 1215773460 in words is "one billion, two hundred fifteen million, seven hundred seventy-three thousand, four hundred sixty".