126189505 has 8 divisors (see below), whose sum is σ = 163075752. Its totient is φ = 93186048.

The previous prime is 126189493. The next prime is 126189509. The reversal of 126189505 is 505981621.

It can be written as a sum of positive squares in 4 ways, for example, as 19439281 + 106750224 = 4409^2 + 10332^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126189505 - 2¹⁹ = 125665217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126189509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970624 + ... + 970753.

It is an arithmetic number, because the mean of its divisors is an integer number (20384469).

Almost surely, 2^126189505 is an apocalyptic number.

It is an amenable number.

126189505 is a deficient number, since it is larger than the sum of its proper divisors (36886247).

126189505 is a wasteful number, since it uses less digits than its factorization.

126189505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941395.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 126189505 is about 11233.4102123977. The cubic root of 126189505 is about 501.5810022613.

The spelling of 126189505 in words is "one hundred twenty-six million, one hundred eighty-nine thousand, five hundred five".