1240442405 has 8 divisors (see below), whose sum is σ = 1488725784. Its totient is φ = 992224000.

The previous prime is 1240442363. The next prime is 1240442407. The reversal of 1240442405 is 5042440421.

It can be written as a sum of positive squares in 4 ways, for example, as 25989604 + 1214452801 = 5098^2 + 34849^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1240442405 - 2⁸ = 1240442149 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 (1240442407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51305 + ... + 71505.

It is an arithmetic number, because the mean of its divisors is an integer number (186090723).

Almost surely, 2^1240442405 is an apocalyptic number.

It is an amenable number.

1240442405 is a deficient number, since it is larger than the sum of its proper divisors (248283379).

1240442405 is a wasteful number, since it uses less digits than its factorization.

1240442405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32487.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 1240442405 is about 35219.9148920039. The cubic root of 1240442405 is about 1074.4648224886.

Adding to 1240442405 its reverse (5042440421), we get a palindrome (6282882826).

The spelling of 1240442405 in words is "one billion, two hundred forty million, four hundred forty-two thousand, four hundred five".