126659989 has 4 divisors (see below), whose sum is σ = 128263360. Its totient is φ = 125056620.

The previous prime is 126659987. The next prime is 126659993. The reversal of 126659989 is 989956621.

It is a happy number.

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 126659989 - 2¹ = 126659987 is a prime.

It is a super-3 number, since 3×126659989³ (a number of 25 digits) contains 333 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 (126659987) 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, 801567 + ... + 801724.

It is an arithmetic number, because the mean of its divisors is an integer number (32065840).

Almost surely, 2^126659989 is an apocalyptic number.

It is an amenable number.

126659989 is a deficient number, since it is larger than the sum of its proper divisors (1603371).

126659989 is an equidigital number, since it uses as much as digits as its factorization.

126659989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603370.

The product of its digits is 2099520, while the sum is 55.

The square root of 126659989 is about 11254.3320103860. The cubic root of 126659989 is about 502.2035927576.

The spelling of 126659989 in words is "one hundred twenty-six million, six hundred fifty-nine thousand, nine hundred eighty-nine".