1215540590 has 48 divisors (see below), whose sum is σ = 2439007200. Its totient is φ = 435758400.

The previous prime is 1215540589. The next prime is 1215540643. The reversal of 1215540590 is 950455121.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78836 + ... + 92984.

It is an arithmetic number, because the mean of its divisors is an integer number (50812650).

Almost surely, 2^1215540590 is an apocalyptic number.

1215540590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1215540590 is an abundant number, since it is smaller than the sum of its proper divisors (1223466610).

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

1215540590 is a wasteful number, since it uses less digits than its factorization.

1215540590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14249 (or 14238 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 1215540590 is about 34864.6036833921. The cubic root of 1215540590 is about 1067.2262247502.

The spelling of 1215540590 in words is "one billion, two hundred fifteen million, five hundred forty thousand, five hundred ninety".