1240252489 has 4 divisors (see below), whose sum is σ = 1417431424. Its totient is φ = 1063073556.

The previous prime is 1240252487. The next prime is 1240252513. The reversal of 1240252489 is 9842520421.

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: 9842520421 = 30809 ⋅319469.

It is a cyclic number.

It is not a de Polignac number, because 1240252489 - 2¹ = 1240252487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240252487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88589457 + ... + 88589470.

It is an arithmetic number, because the mean of its divisors is an integer number (354357856).

Almost surely, 2^1240252489 is an apocalyptic number.

It is an amenable number.

1240252489 is a deficient number, since it is larger than the sum of its proper divisors (177178935).

1240252489 is an equidigital number, since it uses as much as digits as its factorization.

1240252489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177178934.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 1240252489 is about 35217.2186437260. The cubic root of 1240252489 is about 1074.4099849362.

The spelling of 1240252489 in words is "one billion, two hundred forty million, two hundred fifty-two thousand, four hundred eighty-nine".