1290426679 has 4 divisors (see below), whose sum is σ = 1296061960. Its totient is φ = 1284791400.

The previous prime is 1290426671. The next prime is 1290426691. The reversal of 1290426679 is 9766240921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9766240921 = 829 ⋅11780749.

It is a cyclic number.

It is not a de Polignac number, because 1290426679 - 2³ = 1290426671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290426671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2817297 + ... + 2817754.

It is an arithmetic number, because the mean of its divisors is an integer number (324015490).

Almost surely, 2^1290426679 is an apocalyptic number.

1290426679 is a deficient number, since it is larger than the sum of its proper divisors (5635281).

1290426679 is an equidigital number, since it uses as much as digits as its factorization.

1290426679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5635280.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 1290426679 is about 35922.5093639072. The cubic root of 1290426679 is about 1088.7072402001.

The spelling of 1290426679 in words is "one billion, two hundred ninety million, four hundred twenty-six thousand, six hundred seventy-nine".