126639746 has 4 divisors (see below), whose sum is σ = 189959622. Its totient is φ = 63319872.

The previous prime is 126639739. The next prime is 126639757. The reversal of 126639746 is 647936621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 647936621 = 151 ⋅4290971.

It can be written as a sum of positive squares in only one way, i.e., 85359121 + 41280625 = 9239^2 + 6425^2 .

It is a junction number, because it is equal to n+sod(n) for n = 126639697 and 126639706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31659935 + ... + 31659938.

Almost surely, 2^126639746 is an apocalyptic number.

126639746 is a deficient number, since it is larger than the sum of its proper divisors (63319876).

126639746 is an equidigital number, since it uses as much as digits as its factorization.

126639746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63319875.

The product of its digits is 326592, while the sum is 44.

The square root of 126639746 is about 11253.4326318684. The cubic root of 126639746 is about 502.1768370077.

The spelling of 126639746 in words is "one hundred twenty-six million, six hundred thirty-nine thousand, seven hundred forty-six".