1215498240 has 432 divisors, whose sum is σ = 4672968300. Its totient is φ = 291962880.

The previous prime is 1215498223. The next prime is 1215498241. The reversal of 1215498240 is 428945121.

1215498240 is a `hidden beast` number, since 121 + 5 + 498 + 2 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1214383104 + 1115136 = 34848^2 + 1056^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1215498195 and 1215498204.

It is not an unprimeable number, because it can be changed into a prime (1215498241) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11151306 + ... + 11151414.

Almost surely, 2^1215498240 is an apocalyptic number.

1215498240 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 1215498240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2336484150).

1215498240 is an abundant number, since it is smaller than the sum of its proper divisors (3457470060).

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

1215498240 is a wasteful number, since it uses less digits than its factorization.

1215498240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1215498240 is about 34863.9963285909. The cubic root of 1215498240 is about 1067.2138303867.

The spelling of 1215498240 in words is "one billion, two hundred fifteen million, four hundred ninety-eight thousand, two hundred forty".