1240400353 has 4 divisors (see below), whose sum is σ = 1241014320. Its totient is φ = 1239786388.

The previous prime is 1240400341. The next prime is 1240400363. The reversal of 1240400353 is 3530040421.

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 1240400353 - 2⁹ = 1240399841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240400363) 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, 303943 + ... + 307996.

It is an arithmetic number, because the mean of its divisors is an integer number (310253580).

Almost surely, 2^1240400353 is an apocalyptic number.

It is an amenable number.

1240400353 is a deficient number, since it is larger than the sum of its proper divisors (613967).

1240400353 is an equidigital number, since it uses as much as digits as its factorization.

1240400353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613966.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 1240400353 is about 35219.3178951552. The cubic root of 1240400353 is about 1074.4526806094.

Adding to 1240400353 its reverse (3530040421), we get a palindrome (4770440774).

The spelling of 1240400353 in words is "one billion, two hundred forty million, four hundred thousand, three hundred fifty-three".