1215463860 has 288 divisors, whose sum is σ = 4214595840. Its totient is φ = 289059840.

The previous prime is 1215463849. The next prime is 1215463867. The reversal of 1215463860 is 683645121.

It is a happy number.

1215463860 is a `hidden beast` number, since 1 + 2 + 15 + 4 + 638 + 6 + 0 = 666.

It is a super-3 number, since 3×1215463860³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215463867) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11800569 + ... + 11800671.

Almost surely, 2^1215463860 is an apocalyptic number.

1215463860 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 1215463860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2107297920).

1215463860 is an abundant number, since it is smaller than the sum of its proper divisors (2999131980).

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

1215463860 is a wasteful number, since it uses less digits than its factorization.

1215463860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1215463860 is about 34863.5032663099. The cubic root of 1215463860 is about 1067.2037683518.

The spelling of 1215463860 in words is "one billion, two hundred fifteen million, four hundred sixty-three thousand, eight hundred sixty".