1240533155 has 4 divisors (see below), whose sum is σ = 1488639792. Its totient is φ = 992426520.

The previous prime is 1240533139. The next prime is 1240533157. The reversal of 1240533155 is 5513350421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5513350421 = 20269 ⋅272009.

It is not a de Polignac number, because 1240533155 - 2⁴ = 1240533139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240533157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124053311 + ... + 124053320.

It is an arithmetic number, because the mean of its divisors is an integer number (372159948).

Almost surely, 2^1240533155 is an apocalyptic number.

1240533155 is a deficient number, since it is larger than the sum of its proper divisors (248106637).

1240533155 is an equidigital number, since it uses as much as digits as its factorization.

1240533155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248106636.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 1240533155 is about 35221.2032020486. The cubic root of 1240533155 is about 1074.4910242438.

Adding to 1240533155 its reverse (5513350421), we get a palindrome (6753883576).

The spelling of 1240533155 in words is "one billion, two hundred forty million, five hundred thirty-three thousand, one hundred fifty-five".