126939405 has 32 divisors (see below), whose sum is σ = 206244864. Its totient is φ = 66663936.

The previous prime is 126939401. The next prime is 126939443. The reversal of 126939405 is 504939621.

It is not a de Polignac number, because 126939405 - 2² = 126939401 is a prime.

It is a super-2 number, since 2×126939405² = 32227225083508050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126939401) 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 31 ways as a sum of consecutive naturals, for example, 458127 + ... + 458403.

It is an arithmetic number, because the mean of its divisors is an integer number (6445152).

Almost surely, 2^126939405 is an apocalyptic number.

126939405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126939405 is a deficient number, since it is larger than the sum of its proper divisors (79305459).

126939405 is a wasteful number, since it uses less digits than its factorization.

126939405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 58320, while the sum is 39.

The square root of 126939405 is about 11266.7388804392. The cubic root of 126939405 is about 502.5726139464.

The spelling of 126939405 in words is "one hundred twenty-six million, nine hundred thirty-nine thousand, four hundred five".