1242240440 has 64 divisors (see below), whose sum is σ = 3198225600. Its totient is φ = 425392128.

The previous prime is 1242240437. The next prime is 1242240451. The reversal of 1242240440 is 440422421.

It is a super-2 number, since 2×1242240440² = 3086322621542787200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 280322 + ... + 284718.

It is an arithmetic number, because the mean of its divisors is an integer number (49972275).

Almost surely, 2^1242240440 is an apocalyptic number.

1242240440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242240440 is an abundant number, since it is smaller than the sum of its proper divisors (1955985160).

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

1242240440 is a wasteful number, since it uses less digits than its factorization.

1242240440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424 (or 5420 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 23.

The square root of 1242240440 is about 35245.4314770014. The cubic root of 1242240440 is about 1074.9837214048.

Adding to 1242240440 its reverse (440422421), we get a palindrome (1682662861).

The spelling of 1242240440 in words is "one billion, two hundred forty-two million, two hundred forty thousand, four hundred forty".