126949729 has 4 divisors (see below), whose sum is σ = 127758484. Its totient is φ = 126140976.

The previous prime is 126949721. The next prime is 126949751. The reversal of 126949729 is 927949621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31360000 + 95589729 = 5600^2 + 9777^2 .

It is a cyclic number.

It is not a de Polignac number, because 126949729 - 2³ = 126949721 is a prime.

It is a super-2 number, since 2×126949729² = 32232467386346882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126949721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404142 + ... + 404455.

It is an arithmetic number, because the mean of its divisors is an integer number (31939621).

Almost surely, 2^126949729 is an apocalyptic number.

It is an amenable number.

126949729 is a deficient number, since it is larger than the sum of its proper divisors (808755).

126949729 is an equidigital number, since it uses as much as digits as its factorization.

126949729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808754.

The product of its digits is 489888, while the sum is 49.

The square root of 126949729 is about 11267.1970338678. The cubic root of 126949729 is about 502.5862383446.

The spelling of 126949729 in words is "one hundred twenty-six million, nine hundred forty-nine thousand, seven hundred twenty-nine".