1279402423 has 4 divisors (see below), whose sum is σ = 1377818008. Its totient is φ = 1180986840.

The previous prime is 1279402403. The next prime is 1279402441. The reversal of 1279402423 is 3242049721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1279402423 - 2⁹ = 1279401911 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 (1279402403) 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 3 ways as a sum of consecutive naturals, for example, 49207773 + ... + 49207798.

It is an arithmetic number, because the mean of its divisors is an integer number (344454502).

Almost surely, 2^1279402423 is an apocalyptic number.

1279402423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1279402423 is a deficient number, since it is larger than the sum of its proper divisors (98415585).

1279402423 is an equidigital number, since it uses as much as digits as its factorization.

1279402423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98415584.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 1279402423 is about 35768.7352725813. The cubic root of 1279402423 is about 1085.5980543435.

The spelling of 1279402423 in words is "one billion, two hundred seventy-nine million, four hundred two thousand, four hundred twenty-three".