1242130340 has 36 divisors (see below), whose sum is σ = 2867170908. Its totient is φ = 451682880.

The previous prime is 1242130333. The next prime is 1242130343. The reversal of 1242130340 is 430312421.

It can be written as a sum of positive squares in 2 ways, for example, as 907093924 + 335036416 = 30118^2 + 18304^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (1242130343) 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 11 ways as a sum of consecutive naturals, for example, 254219 + ... + 259058.

Almost surely, 2^1242130340 is an apocalyptic number.

1242130340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242130340 is an abundant number, since it is smaller than the sum of its proper divisors (1625040568).

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

1242130340 is a wasteful number, since it uses less digits than its factorization.

1242130340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513308 (or 513295 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1242130340 is about 35243.8695378359. The cubic root of 1242130340 is about 1074.9519617978.

Adding to 1242130340 its reverse (430312421), we get a palindrome (1672442761).

The spelling of 1242130340 in words is "one billion, two hundred forty-two million, one hundred thirty thousand, three hundred forty".