1242144240 has 80 divisors (see below), whose sum is σ = 3983450400. Its totient is φ = 319814656.

The previous prime is 1242144223. The next prime is 1242144283. The reversal of 1242144240 is 424412421.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1242144240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82275 + ... + 96194.

It is an arithmetic number, because the mean of its divisors is an integer number (49793130).

Almost surely, 2^1242144240 is an apocalyptic number.

1242144240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242144240 is an abundant number, since it is smaller than the sum of its proper divisors (2741306160).

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

1242144240 is a wasteful number, since it uses less digits than its factorization.

1242144240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178514 (or 178508 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 1242144240 is about 35244.0667347002. The cubic root of 1242144240 is about 1074.9559715157.

Adding to 1242144240 its reverse (424412421), we get a palindrome (1666556661).

The spelling of 1242144240 in words is "one billion, two hundred forty-two million, one hundred forty-four thousand, two hundred forty".