126978729 has 16 divisors (see below), whose sum is σ = 188700480. Its totient is φ = 75479040.

The previous prime is 126978721. The next prime is 126978749. The reversal of 126978729 is 927879621.

It is not a de Polignac number, because 126978729 - 2³ = 126978721 is a prime.

It is a super-2 number, since 2×126978729² = 32247195236910882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (126978721) 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, 64552 + ... + 66489.

It is an arithmetic number, because the mean of its divisors is an integer number (11793780).

Almost surely, 2^126978729 is an apocalyptic number.

126978729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

126978729 is a deficient number, since it is larger than the sum of its proper divisors (61721751).

126978729 is a wasteful number, since it uses less digits than its factorization.

126978729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131080.

The product of its digits is 762048, while the sum is 51.

The square root of 126978729 is about 11268.4838820491. The cubic root of 126978729 is about 502.6245051750.

The spelling of 126978729 in words is "one hundred twenty-six million, nine hundred seventy-eight thousand, seven hundred twenty-nine".