126320819 has 4 divisors (see below), whose sum is σ = 129008544. Its totient is φ = 123633096.

The previous prime is 126320791. The next prime is 126320827. The reversal of 126320819 is 918023621.

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 126320819 - 2²⁰ = 125272243 is a prime.

It is a super-2 number, since 2×126320819² = 31913898625661522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126320219) 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, 1343792 + ... + 1343885.

It is an arithmetic number, because the mean of its divisors is an integer number (32252136).

Almost surely, 2^126320819 is an apocalyptic number.

126320819 is a deficient number, since it is larger than the sum of its proper divisors (2687725).

126320819 is an equidigital number, since it uses as much as digits as its factorization.

126320819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2687724.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 126320819 is about 11239.2534894449. The cubic root of 126320819 is about 501.7549252683.

The spelling of 126320819 in words is "one hundred twenty-six million, three hundred twenty thousand, eight hundred nineteen".