126745989 has 4 divisors (see below), whose sum is σ = 168994656. Its totient is φ = 84497324.

The previous prime is 126745973. The next prime is 126746003. The reversal of 126745989 is 989547621.

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 126745989 - 2⁴ = 126745973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126745189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21124329 + ... + 21124334.

It is an arithmetic number, because the mean of its divisors is an integer number (42248664).

Almost surely, 2^126745989 is an apocalyptic number.

It is an amenable number.

126745989 is a deficient number, since it is larger than the sum of its proper divisors (42248667).

126745989 is an equidigital number, since it uses as much as digits as its factorization.

126745989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42248666.

The product of its digits is 1088640, while the sum is 51.

The square root of 126745989 is about 11258.1521130246. The cubic root of 126745989 is about 502.3172296370.

The spelling of 126745989 in words is "one hundred twenty-six million, seven hundred forty-five thousand, nine hundred eighty-nine".