126620013 has 16 divisors (see below), whose sum is σ = 186250176. Its totient is φ = 76018560.

The previous prime is 126619981. The next prime is 126620057. The reversal of 126620013 is 310026621.

It is a happy number.

It is not a de Polignac number, because 126620013 - 2⁵ = 126619981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126620113) 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 15 ways as a sum of consecutive naturals, for example, 37995 + ... + 41192.

It is an arithmetic number, because the mean of its divisors is an integer number (11640636).

Almost surely, 2^126620013 is an apocalyptic number.

126620013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

126620013 is a deficient number, since it is larger than the sum of its proper divisors (59630163).

126620013 is a wasteful number, since it uses less digits than its factorization.

126620013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79244.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 126620013 is about 11252.5558430074. Note that the first 3 decimals coincide. The cubic root of 126620013 is about 502.1507525948.

Adding to 126620013 its reverse (310026621), we get a palindrome (436646634).

The spelling of 126620013 in words is "one hundred twenty-six million, six hundred twenty thousand, thirteen".