126403889 has 4 divisors (see below), whose sum is σ = 126438180. Its totient is φ = 126369600.

The previous prime is 126403867. The next prime is 126403897. The reversal of 126403889 is 988304621.

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 30030400 + 96373489 = 5480^2 + 9817^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126403889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126403829) 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, 10844 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (31609545).

Almost surely, 2^126403889 is an apocalyptic number.

It is an amenable number.

126403889 is a deficient number, since it is larger than the sum of its proper divisors (34291).

126403889 is an equidigital number, since it uses as much as digits as its factorization.

126403889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34290.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 126403889 is about 11242.9484122271. The cubic root of 126403889 is about 501.8648877398.

The spelling of 126403889 in words is "one hundred twenty-six million, four hundred three thousand, eight hundred eighty-nine".