126787 has 4 divisors (see below), whose sum is σ = 133480. Its totient is φ = 120096.

The previous prime is 126781. The next prime is 126823. The reversal of 126787 is 787621.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126787 - 2¹¹ = 124739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3318 + ... + 3355.

It is an arithmetic number, because the mean of its divisors is an integer number (33370).

2¹²⁶⁷⁸⁷ is an apocalyptic number.

126787 is a deficient number, since it is larger than the sum of its proper divisors (6693).

126787 is an equidigital number, since it uses as much as digits as its factorization.

126787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6692.

The product of its digits is 4704, while the sum is 31.

The square root of 126787 is about 356.0716220088. The cubic root of 126787 is about 50.2371401793.

Subtracting from 126787 its sum of digits (31), we obtain a triangular number (126756 = T₅₀₃).

The spelling of 126787 in words is "one hundred twenty-six thousand, seven hundred eighty-seven".