126635749 has 4 divisors (see below), whose sum is σ = 126683136. Its totient is φ = 126588364.

The previous prime is 126635701. The next prime is 126635753. The reversal of 126635749 is 947536621.

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 126635749 - 2¹¹ = 126633701 is a prime.

It is a super-2 number, since 2×126635749² = 32073225849582002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126635759) 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, 19429 + ... + 25114.

It is an arithmetic number, because the mean of its divisors is an integer number (31670784).

Almost surely, 2^126635749 is an apocalyptic number.

It is an amenable number.

126635749 is a deficient number, since it is larger than the sum of its proper divisors (47387).

126635749 is an equidigital number, since it uses as much as digits as its factorization.

126635749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47386.

The product of its digits is 272160, while the sum is 43.

The square root of 126635749 is about 11253.2550402095. The cubic root of 126635749 is about 502.1715537218.

The spelling of 126635749 in words is "one hundred twenty-six million, six hundred thirty-five thousand, seven hundred forty-nine".