1240534213 has 4 divisors (see below), whose sum is σ = 1240712640. Its totient is φ = 1240355788.

The previous prime is 1240534201. The next prime is 1240534231. The reversal of 1240534213 is 3124350421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3124350421 = 457 ⋅6836653.

It is a cyclic number.

It is not a de Polignac number, because 1240534213 - 2⁵ = 1240534181 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 (1240537213) 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, 78343 + ... + 92836.

It is an arithmetic number, because the mean of its divisors is an integer number (310178160).

Almost surely, 2^1240534213 is an apocalyptic number.

It is an amenable number.

1240534213 is a deficient number, since it is larger than the sum of its proper divisors (178427).

1240534213 is an equidigital number, since it uses as much as digits as its factorization.

1240534213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178426.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1240534213 is about 35221.2182214074. The cubic root of 1240534213 is about 1074.4913297069.

Adding to 1240534213 its reverse (3124350421), we get a palindrome (4364884634).

The spelling of 1240534213 in words is "one billion, two hundred forty million, five hundred thirty-four thousand, two hundred thirteen".