1247245842 has 32 divisors (see below), whose sum is σ = 2631121920. Its totient is φ = 393066000.

The previous prime is 1247245829. The next prime is 1247245877. The reversal of 1247245842 is 2485427421.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1247245842.

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, 46467 + ... + 68217.

It is an arithmetic number, because the mean of its divisors is an integer number (82222560).

Almost surely, 2^1247245842 is an apocalyptic number.

1247245842 is an abundant number, since it is smaller than the sum of its proper divisors (1383876078).

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

1247245842 is a wasteful number, since it uses less digits than its factorization.

1247245842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22278.

The product of its digits is 143360, while the sum is 39.

The square root of 1247245842 is about 35316.3679049814. The cubic root of 1247245842 is about 1076.4256094420.

The spelling of 1247245842 in words is "one billion, two hundred forty-seven million, two hundred forty-five thousand, eight hundred forty-two".