1240513155 has 36 divisors (see below), whose sum is σ = 2501284032. Its totient is φ = 567090720.

The previous prime is 1240513133. The next prime is 1240513259. The reversal of 1240513155 is 5513150421.

It is not a de Polignac number, because 1240513155 - 2⁹ = 1240512643 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 279091 + ... + 283500.

It is an arithmetic number, because the mean of its divisors is an integer number (69480112).

Almost surely, 2^1240513155 is an apocalyptic number.

1240513155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1240513155 is an abundant number, since it is smaller than the sum of its proper divisors (1260770877).

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

1240513155 is a wasteful number, since it uses less digits than its factorization.

1240513155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562616 (or 562606 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1240513155 is about 35220.9192810182. The cubic root of 1240513155 is about 1074.4852498621.

Adding to 1240513155 its reverse (5513150421), we get a palindrome (6753663576).

The spelling of 1240513155 in words is "one billion, two hundred forty million, five hundred thirteen thousand, one hundred fifty-five".