1279696401 has 20 divisors (see below), whose sum is σ = 1952324352. Its totient is φ = 834976728.

The previous prime is 1279696381. The next prime is 1279696409. The reversal of 1279696401 is 1046969721.

It is not a de Polignac number, because 1279696401 - 2¹⁹ = 1279172113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1279696409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 164265 + ... + 171878.

Almost surely, 2^1279696401 is an apocalyptic number.

It is an amenable number.

1279696401 is a deficient number, since it is larger than the sum of its proper divisors (672627951).

1279696401 is an equidigital number, since it uses as much as digits as its factorization.

1279696401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336202 (or 336193 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1279696401 is about 35772.8444633635. The cubic root of 1279696401 is about 1085.6811966757.

The spelling of 1279696401 in words is "one billion, two hundred seventy-nine million, six hundred ninety-six thousand, four hundred one".