1279727972402 has 32 divisors (see below), whose sum is σ = 2098726761600. Its totient is φ = 580410679680.

The previous prime is 1279727972401. The next prime is 1279727972489. The reversal of 1279727972402 is 2042797279721.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1279727972401) 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, 20805998 + ... + 20867414.

It is an arithmetic number, because the mean of its divisors is an integer number (65585211300).

Almost surely, 2^{1279727972402} is an apocalyptic number.

1279727972402 is a deficient number, since it is larger than the sum of its proper divisors (818998789198).

1279727972402 is a wasteful number, since it uses less digits than its factorization.

1279727972402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63506.

The product of its (nonzero) digits is 12446784, while the sum is 59.

The spelling of 1279727972402 in words is "one trillion, two hundred seventy-nine billion, seven hundred twenty-seven million, nine hundred seventy-two thousand, four hundred two".