1242909864 has 48 divisors (see below), whose sum is σ = 3847103520. Its totient is φ = 355116960.

The previous prime is 1242909853. The next prime is 1242909893. The reversal of 1242909864 is 4689092421.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1232542 + ... + 1233549.

It is an arithmetic number, because the mean of its divisors is an integer number (80147990).

Almost surely, 2^1242909864 is an apocalyptic number.

1242909864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1242909864 is an abundant number, since it is smaller than the sum of its proper divisors (2604193656).

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

1242909864 is a wasteful number, since it uses less digits than its factorization.

1242909864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466110 (or 2466103 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1242909864 is about 35254.9268046326. The cubic root of 1242909864 is about 1075.1767840504.

The spelling of 1242909864 in words is "one billion, two hundred forty-two million, nine hundred nine thousand, eight hundred sixty-four".