1215940608 has 144 divisors (see below), whose sum is σ = 3599750700. Its totient is φ = 395182080.

The previous prime is 1215940601. The next prime is 1215940613. The reversal of 1215940608 is 8060495121.

1215940608 is a `hidden beast` number, since 1 + 2 + 1 + 5 + 9 + 40 + 608 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1214383104 + 1557504 = 34848^2 + 1248^2 .

It is a tau number, because it is divible by the number of its divisors (144).

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

It is not an unprimeable number, because it can be changed into a prime (1215940601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754908 + ... + 756516.

Almost surely, 2^1215940608 is an apocalyptic number.

1215940608 is a gapful number since it is divisible by the number (18) 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 1215940608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799875350).

1215940608 is an abundant number, since it is smaller than the sum of its proper divisors (2383810092).

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

1215940608 is a wasteful number, since it uses less digits than its factorization.

1215940608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1215940608 is about 34870.3399467226. The cubic root of 1215940608 is about 1067.3432818253.

The spelling of 1215940608 in words is "one billion, two hundred fifteen million, nine hundred forty thousand, six hundred eight".