1240406261503 has 4 divisors (see below), whose sum is σ = 1283178891240. Its totient is φ = 1197633631768.

The previous prime is 1240406261489. The next prime is 1240406261543. The reversal of 1240406261503 is 3051626040421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240406261503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240406261543) 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, 21386314825 + ... + 21386314882.

It is an arithmetic number, because the mean of its divisors is an integer number (320794722810).

Almost surely, 2^{1240406261503} is an apocalyptic number.

1240406261503 is a deficient number, since it is larger than the sum of its proper divisors (42772629737).

1240406261503 is an equidigital number, since it uses as much as digits as its factorization.

1240406261503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42772629736.

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 1240406261503 in words is "one trillion, two hundred forty billion, four hundred six million, two hundred sixty-one thousand, five hundred three".