1240320453 has 4 divisors (see below), whose sum is σ = 1653760608. Its totient is φ = 826880300.

The previous prime is 1240320421. The next prime is 1240320457. The reversal of 1240320453 is 3540230421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1240320453 - 2⁵ = 1240320421 is a prime.

It is a super-2 number, since 2×1240320453² = 3076789652260250418, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240320457) 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 3 ways as a sum of consecutive naturals, for example, 206720073 + ... + 206720078.

It is an arithmetic number, because the mean of its divisors is an integer number (413440152).

Almost surely, 2^1240320453 is an apocalyptic number.

It is an amenable number.

1240320453 is a deficient number, since it is larger than the sum of its proper divisors (413440155).

1240320453 is an equidigital number, since it uses as much as digits as its factorization.

1240320453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413440154.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 1240320453 is about 35218.1835562256. The cubic root of 1240320453 is about 1074.4296099365.

Adding to 1240320453 its reverse (3540230421), we get a palindrome (4780550874).

The spelling of 1240320453 in words is "one billion, two hundred forty million, three hundred twenty thousand, four hundred fifty-three".