1240432142405 has 4 divisors (see below), whose sum is σ = 1488518570892. Its totient is φ = 992345713920.

The previous prime is 1240432142401. The next prime is 1240432142413. The reversal of 1240432142405 is 5042412340421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130304394529 + 1110127747876 = 360977^2 + 1053626^2 .

It is not a de Polignac number, because 1240432142405 - 2² = 1240432142401 is a prime.

It is a super-2 number, since 2×1240432142405² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240432142401) 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, 124043214236 + ... + 124043214245.

It is an arithmetic number, because the mean of its divisors is an integer number (372129642723).

Almost surely, 2^{1240432142405} is an apocalyptic number.

It is an amenable number.

1240432142405 is a deficient number, since it is larger than the sum of its proper divisors (248086428487).

1240432142405 is an equidigital number, since it uses as much as digits as its factorization.

1240432142405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248086428486.

The product of its (nonzero) digits is 30720, while the sum is 32.

Adding to 1240432142405 its reverse (5042412340421), we get a palindrome (6282844482826).

The spelling of 1240432142405 in words is "one trillion, two hundred forty billion, four hundred thirty-two million, one hundred forty-two thousand, four hundred five".