126198647 has 4 divisors (see below), whose sum is σ = 126852720. Its totient is φ = 125544576.

The previous prime is 126198643. The next prime is 126198659. The reversal of 126198647 is 746891621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746891621 = 7 ⋅106698803.

It is a cyclic number.

It is not a de Polignac number, because 126198647 - 2² = 126198643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126198598 and 126198607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126198643) 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, 326747 + ... + 327132.

It is an arithmetic number, because the mean of its divisors is an integer number (31713180).

Almost surely, 2^126198647 is an apocalyptic number.

126198647 is a deficient number, since it is larger than the sum of its proper divisors (654073).

126198647 is an equidigital number, since it uses as much as digits as its factorization.

126198647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654072.

The product of its digits is 145152, while the sum is 44.

The square root of 126198647 is about 11233.8171161898. The cubic root of 126198647 is about 501.5931145807.

The spelling of 126198647 in words is "one hundred twenty-six million, one hundred ninety-eight thousand, six hundred forty-seven".