1240135445 has 4 divisors (see below), whose sum is σ = 1488162540. Its totient is φ = 992108352.

The previous prime is 1240135441. The next prime is 1240135447. The reversal of 1240135445 is 5445310421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5445310421 = 23 ⋅236752627.

It can be written as a sum of positive squares in 2 ways, for example, as 168948004 + 1071187441 = 12998^2 + 32729^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240135445 - 2² = 1240135441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240135441) 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, 124013540 + ... + 124013549.

It is an arithmetic number, because the mean of its divisors is an integer number (372040635).

Almost surely, 2^1240135445 is an apocalyptic number.

It is an amenable number.

1240135445 is a deficient number, since it is larger than the sum of its proper divisors (248027095).

1240135445 is an equidigital number, since it uses as much as digits as its factorization.

1240135445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248027094.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1240135445 is about 35215.5568605694. The cubic root of 1240135445 is about 1074.3761861198.

Adding to 1240135445 its reverse (5445310421), we get a palindrome (6685445866).

The spelling of 1240135445 in words is "one billion, two hundred forty million, one hundred thirty-five thousand, four hundred forty-five".