1240542145 has 8 divisors (see below), whose sum is σ = 1553374656. Its totient is φ = 949284336.

The previous prime is 1240542143. The next prime is 1240542151. The reversal of 1240542145 is 5412450421.

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

It is not a de Polignac number, because 1240542145 - 2¹ = 1240542143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240542143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5393547 + ... + 5393776.

It is an arithmetic number, because the mean of its divisors is an integer number (194171832).

Almost surely, 2^1240542145 is an apocalyptic number.

It is an amenable number.

1240542145 is a deficient number, since it is larger than the sum of its proper divisors (312832511).

1240542145 is a wasteful number, since it uses less digits than its factorization.

1240542145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10787351.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 1240542145 is about 35221.3308238062. The cubic root of 1240542145 is about 1074.4936198082.

Adding to 1240542145 its reverse (5412450421), we get a palindrome (6652992566).

The spelling of 1240542145 in words is "one billion, two hundred forty million, five hundred forty-two thousand, one hundred forty-five".