1279900043 has 2 divisors, whose sum is σ = 1279900044. Its totient is φ = 1279900042.

The previous prime is 1279900019. The next prime is 1279900049. The reversal of 1279900043 is 3400099721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1279900043 - 2⁸ = 1279899787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279899976 and 1279900012.

It is not a weakly prime, because it can be changed into another prime (1279900049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639950021 + 639950022.

It is an arithmetic number, because the mean of its divisors is an integer number (639950022).

Almost surely, 2^1279900043 is an apocalyptic number.

1279900043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279900043 is an equidigital number, since it uses as much as digits as its factorization.

1279900043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 1279900043 is about 35775.6906711806. The cubic root of 1279900043 is about 1085.7387828771.

Adding to 1279900043 its reverse (3400099721), we get a palindrome (4679999764).

The spelling of 1279900043 in words is "one billion, two hundred seventy-nine million, nine hundred thousand, forty-three".