1279900943 has 2 divisors, whose sum is σ = 1279900944. Its totient is φ = 1279900942.

The previous prime is 1279900931. The next prime is 1279900967. The reversal of 1279900943 is 3490099721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1279900943 - 2²⁸ = 1011465487 is a prime.

It is a super-4 number, since 4×1279900943⁴ (a number of 38 digits) contains 4444 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1279900894 and 1279900903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1279900043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639950471 + 639950472.

It is an arithmetic number, because the mean of its divisors is an integer number (639950472).

Almost surely, 2^1279900943 is an apocalyptic number.

1279900943 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279900943 is an equidigital number, since it uses as much as digits as its factorization.

1279900943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 1279900943 is about 35775.7032495519. The cubic root of 1279900943 is about 1085.7390373669.

The spelling of 1279900943 in words is "one billion, two hundred seventy-nine million, nine hundred thousand, nine hundred forty-three".