643126 has 32 divisors (see below), whose sum is σ = 1161216. Its totient is φ = 264000.

The previous prime is 643121. The next prime is 643129. The reversal of 643126 is 621346.

643126 = T₆₈ + T₆₉ + ... + T₁₆₀.

It is a super-2 number, since 2×643126² = 827222103752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

Its product of digits (864) is a multiple of the sum of its prime divisors (108).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 643097 and 643106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643121) 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, 15666 + ... + 15706.

It is an arithmetic number, because the mean of its divisors is an integer number (36288).

2⁶⁴³¹²⁶ is an apocalyptic number.

643126 is a deficient number, since it is larger than the sum of its proper divisors (518090).

643126 is a wasteful number, since it uses less digits than its factorization.

643126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108.

The product of its digits is 864, while the sum is 22.

The square root of 643126 is about 801.9513700967. The cubic root of 643126 is about 86.3174673401.

It can be divided in two parts, 643 and 126, that multiplied together give a palindrome (81018).

The spelling of 643126 in words is "six hundred forty-three thousand, one hundred twenty-six".