1242102440 has 32 divisors (see below), whose sum is σ = 2796716160. Its totient is φ = 496488000.

The previous prime is 1242102437. The next prime is 1242102457. The reversal of 1242102440 is 442012421.

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

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 7 ways as a sum of consecutive naturals, for example, 50165 + ... + 70715.

It is an arithmetic number, because the mean of its divisors is an integer number (87397380).

Almost surely, 2^1242102440 is an apocalyptic number.

1242102440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242102440 is an abundant number, since it is smaller than the sum of its proper divisors (1554613720).

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

1242102440 is a wasteful number, since it uses less digits than its factorization.

1242102440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22073 (or 22069 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 1242102440 is about 35243.4737220950. The cubic root of 1242102440 is about 1074.9439134250.

Adding to 1242102440 its reverse (442012421), we get a palindrome (1684114861).

The spelling of 1242102440 in words is "one billion, two hundred forty-two million, one hundred two thousand, four hundred forty".