126642657 has 16 divisors (see below), whose sum is σ = 183480320. Its totient is φ = 77403600.

The previous prime is 126642641. The next prime is 126642667. The reversal of 126642657 is 756246621.

It is not a de Polignac number, because 126642657 - 2⁴ = 126642641 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (126642667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34069 + ... + 37602.

It is an arithmetic number, because the mean of its divisors is an integer number (11467520).

Almost surely, 2^126642657 is an apocalyptic number.

It is an amenable number.

126642657 is a deficient number, since it is larger than the sum of its proper divisors (56837663).

126642657 is a wasteful number, since it uses less digits than its factorization.

126642657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71724.

The product of its digits is 120960, while the sum is 39.

The square root of 126642657 is about 11253.5619694388. The cubic root of 126642657 is about 502.1806847348.

The spelling of 126642657 in words is "one hundred twenty-six million, six hundred forty-two thousand, six hundred fifty-seven".