1242434440 has 32 divisors (see below), whose sum is σ = 3010515480. Its totient is φ = 458744832.

The previous prime is 1242434423. The next prime is 1242434483. The reversal of 1242434440 is 444342421.

It can be written as a sum of positive squares in 4 ways, for example, as 836250724 + 406183716 = 28918^2 + 20154^2 .

It is a super-2 number, since 2×1242434440² = 3087286675396227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1242434399 and 1242434408.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194129 + ... + 1195168.

Almost surely, 2^1242434440 is an apocalyptic number.

1242434440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242434440 is an abundant number, since it is smaller than the sum of its proper divisors (1768081040).

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

1242434440 is a wasteful number, since it uses less digits than its factorization.

1242434440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2389321 (or 2389317 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 28.

The square root of 1242434440 is about 35248.1834992954. The cubic root of 1242434440 is about 1075.0396783624.

Adding to 1242434440 its reverse (444342421), we get a palindrome (1686776861).

It can be divided in two parts, 12424 and 34440, that added together give a palindrome (46864).

The spelling of 1242434440 in words is "one billion, two hundred forty-two million, four hundred thirty-four thousand, four hundred forty".