1215154240 has 28 divisors (see below), whose sum is σ = 2893586796. Its totient is φ = 486061568.

The previous prime is 1215154223. The next prime is 1215154289. The reversal of 1215154240 is 424515121.

It can be written as a sum of positive squares in 2 ways, for example, as 868598784 + 346555456 = 29472^2 + 18616^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1898359 + ... + 1898998.

Almost surely, 2^1215154240 is an apocalyptic number.

1215154240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215154240 is an abundant number, since it is smaller than the sum of its proper divisors (1678432556).

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

1215154240 is an equidigital number, since it uses as much as digits as its factorization.

1215154240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797374 (or 3797364 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 1215154240 is about 34859.0625232521. The cubic root of 1215154240 is about 1067.1131429528.

Adding to 1215154240 its reverse (424515121), we get a palindrome (1639669361).

The spelling of 1215154240 in words is "one billion, two hundred fifteen million, one hundred fifty-four thousand, two hundred forty".