1247972642 has 32 divisors (see below), whose sum is σ = 2213720064. Its totient is φ = 516344400.

The previous prime is 1247972641. The next prime is 1247972659. The reversal of 1247972642 is 2462797421.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1247972593 and 1247972602.

It is not an unprimeable number, because it can be changed into a prime (1247972641) 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, 189017 + ... + 195507.

It is an arithmetic number, because the mean of its divisors is an integer number (69178752).

Almost surely, 2^1247972642 is an apocalyptic number.

1247972642 is a deficient number, since it is larger than the sum of its proper divisors (965747422).

1247972642 is a wasteful number, since it uses less digits than its factorization.

1247972642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6974.

The product of its digits is 338688, while the sum is 44.

The square root of 1247972642 is about 35326.6562527506. The cubic root of 1247972642 is about 1076.6346551628.

The spelling of 1247972642 in words is "one billion, two hundred forty-seven million, nine hundred seventy-two thousand, six hundred forty-two".