1242540620 has 12 divisors (see below), whose sum is σ = 2609335344. Its totient is φ = 497016240.

The previous prime is 1242540617. The next prime is 1242540631. The reversal of 1242540620 is 260452421.

It is a self number, because there is not a number n which added to its sum of digits gives 1242540620.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31063496 + ... + 31063535.

It is an arithmetic number, because the mean of its divisors is an integer number (217444612).

Almost surely, 2^1242540620 is an apocalyptic number.

1242540620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242540620 is an abundant number, since it is smaller than the sum of its proper divisors (1366794724).

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

1242540620 is a wasteful number, since it uses less digits than its factorization.

1242540620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62127040 (or 62127038 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1242540620 is about 35249.6896440238. The cubic root of 1242540620 is about 1075.0703022348.

The spelling of 1242540620 in words is "one billion, two hundred forty-two million, five hundred forty thousand, six hundred twenty".