126919729 has 4 divisors (see below), whose sum is σ = 127209280. Its totient is φ = 126630180.

The previous prime is 126919697. The next prime is 126919757. The reversal of 126919729 is 927919621.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 126919729 - 2⁵ = 126919697 is a prime.

It is a super-2 number, since 2×126919729² = 32217235218866882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126919759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144117 + ... + 144994.

It is an arithmetic number, because the mean of its divisors is an integer number (31802320).

Almost surely, 2^126919729 is an apocalyptic number.

It is an amenable number.

126919729 is a deficient number, since it is larger than the sum of its proper divisors (289551).

126919729 is an equidigital number, since it uses as much as digits as its factorization.

126919729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289550.

The product of its digits is 122472, while the sum is 46.

The square root of 126919729 is about 11265.8656569302. The cubic root of 126919729 is about 502.5466458353.

The spelling of 126919729 in words is "one hundred twenty-six million, nine hundred nineteen thousand, seven hundred twenty-nine".