1242523140 has 48 divisors (see below), whose sum is σ = 3509872128. Its totient is φ = 328405504.

The previous prime is 1242523129. The next prime is 1242523147. The reversal of 1242523140 is 413252421.

It is a self number, because there is not a number n which added to its sum of digits gives 1242523140.

It is not an unprimeable number, because it can be changed into a prime (1242523147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84852 + ... + 98411.

It is an arithmetic number, because the mean of its divisors is an integer number (73122336).

Almost surely, 2^1242523140 is an apocalyptic number.

1242523140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242523140 is an abundant number, since it is smaller than the sum of its proper divisors (2267348988).

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

1242523140 is a wasteful number, since it uses less digits than its factorization.

1242523140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183388 (or 183386 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1242523140 is about 35249.4416977064. The cubic root of 1242523140 is about 1075.0652608659.

Adding to 1242523140 its reverse (413252421), we get a palindrome (1655775561).

The spelling of 1242523140 in words is "one billion, two hundred forty-two million, five hundred twenty-three thousand, one hundred forty".