126189442 has 4 divisors (see below), whose sum is σ = 189284166. Its totient is φ = 63094720.

The previous prime is 126189433. The next prime is 126189443. The reversal of 126189442 is 244981621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244981621 = 43 ⋅5697247.

It can be written as a sum of positive squares in only one way, i.e., 99780121 + 26409321 = 9989^2 + 5139^2 .

It is not an unprimeable number, because it can be changed into a prime (126189443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31547359 + ... + 31547362.

Almost surely, 2^126189442 is an apocalyptic number.

126189442 is a deficient number, since it is larger than the sum of its proper divisors (63094724).

126189442 is an equidigital number, since it uses as much as digits as its factorization.

126189442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63094723.

The product of its digits is 27648, while the sum is 37.

The square root of 126189442 is about 11233.4074082622. The cubic root of 126189442 is about 501.5809187900.

The spelling of 126189442 in words is "one hundred twenty-six million, one hundred eighty-nine thousand, four hundred forty-two".