1240515655 has 4 divisors (see below), whose sum is σ = 1488618792. Its totient is φ = 992412520.

The previous prime is 1240515641. The next prime is 1240515659. The reversal of 1240515655 is 5565150421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5565150421 = 9323 ⋅596927.

It is not a de Polignac number, because 1240515655 - 2²⁹ = 703644743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240515655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240515659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124051561 + ... + 124051570.

It is an arithmetic number, because the mean of its divisors is an integer number (372154698).

Almost surely, 2^1240515655 is an apocalyptic number.

1240515655 is a deficient number, since it is larger than the sum of its proper divisors (248103137).

1240515655 is an equidigital number, since it uses as much as digits as its factorization.

1240515655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248103136.

The product of its (nonzero) digits is 30000, while the sum is 34.

The square root of 1240515655 is about 35220.9547712722. The cubic root of 1240515655 is about 1074.4859716632.

The spelling of 1240515655 in words is "one billion, two hundred forty million, five hundred fifteen thousand, six hundred fifty-five".