126983809 has 4 divisors (see below), whose sum is σ = 127585840. Its totient is φ = 126381780.

The previous prime is 126983803. The next prime is 126983819. The reversal of 126983809 is 908389621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908389621 = 31 ⋅29302891.

It is a cyclic number.

It is not a de Polignac number, because 126983809 - 2¹⁹ = 126459521 is a prime.

It is a super-2 number, since 2×126983809² = 32249775496296962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126983803) 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, 300699 + ... + 301120.

It is an arithmetic number, because the mean of its divisors is an integer number (31896460).

Almost surely, 2^126983809 is an apocalyptic number.

It is an amenable number.

126983809 is a deficient number, since it is larger than the sum of its proper divisors (602031).

126983809 is an equidigital number, since it uses as much as digits as its factorization.

126983809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602030.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 126983809 is about 11268.7092872254. The cubic root of 126983809 is about 502.6312078683.

It can be divided in two parts, 1269 and 83809, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 126983809 in words is "one hundred twenty-six million, nine hundred eighty-three thousand, eight hundred nine".