1242144520 has 32 divisors (see below), whose sum is σ = 2826235800. Its totient is φ = 491273728.

The previous prime is 1242144499. The next prime is 1242144521. The reversal of 1242144520 is 254412421.

It can be written as a sum of positive squares in 4 ways, for example, as 927933444 + 314211076 = 30462^2 + 17726^2 .

It is not an unprimeable number, because it can be changed into a prime (1242144521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170899 + ... + 178018.

Almost surely, 2^1242144520 is an apocalyptic number.

1242144520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242144520 is an abundant number, since it is smaller than the sum of its proper divisors (1584091280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242144520 is a wasteful number, since it uses less digits than its factorization.

1242144520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349017 (or 349013 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 1242144520 is about 35244.0707069998. The cubic root of 1242144520 is about 1074.9560522867.

Adding to 1242144520 its reverse (254412421), we get a palindrome (1496556941).

The spelling of 1242144520 in words is "one billion, two hundred forty-two million, one hundred forty-four thousand, five hundred twenty".