1240302155 has 4 divisors (see below), whose sum is σ = 1488362592. Its totient is φ = 992241720.

The previous prime is 1240302149. The next prime is 1240302179. The reversal of 1240302155 is 5512030421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1240302155 - 2¹⁴ = 1240285771 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 1240302155.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124030211 + ... + 124030220.

It is an arithmetic number, because the mean of its divisors is an integer number (372090648).

Almost surely, 2^1240302155 is an apocalyptic number.

1240302155 is a deficient number, since it is larger than the sum of its proper divisors (248060437).

1240302155 is an equidigital number, since it uses as much as digits as its factorization.

1240302155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248060436.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1240302155 is about 35217.9237746918. The cubic root of 1240302155 is about 1074.4243263531.

Adding to 1240302155 its reverse (5512030421), we get a palindrome (6752332576).

The spelling of 1240302155 in words is "one billion, two hundred forty million, three hundred two thousand, one hundred fifty-five".