126128889 has 12 divisors (see below), whose sum is σ = 184682836. Its totient is φ = 82933632.

The previous prime is 126128887. The next prime is 126128939. The reversal of 126128889 is 988821621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 53538489 + 72590400 = 7317^2 + 8520^2 .

It is not a de Polignac number, because 126128889 - 2¹ = 126128887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126128881) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95332 + ... + 96645.

Almost surely, 2^126128889 is an apocalyptic number.

It is an amenable number.

126128889 is a deficient number, since it is larger than the sum of its proper divisors (58553947).

126128889 is a wasteful number, since it uses less digits than its factorization.

126128889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192056 (or 192053 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 126128889 is about 11230.7118652381. The cubic root of 126128889 is about 501.5006767657.

The spelling of 126128889 in words is "one hundred twenty-six million, one hundred twenty-eight thousand, eight hundred eighty-nine".