72126843 has 4 divisors (see below), whose sum is σ = 96169128. Its totient is φ = 48084560.

The previous prime is 72126839. The next prime is 72126853. The reversal of 72126843 is 34862127.

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 72126843 - 2² = 72126839 is a prime.

It is a super-2 number, since 2×72126843² = 10404562962293298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72126823) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 12021138 + ... + 12021143.

It is an arithmetic number, because the mean of its divisors is an integer number (24042282).

Almost surely, 2^72126843 is an apocalyptic number.

72126843 is a deficient number, since it is larger than the sum of its proper divisors (24042285).

72126843 is a wasteful number, since it uses less digits than its factorization.

72126843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24042284.

The product of its digits is 16128, while the sum is 33.

The square root of 72126843 is about 8492.7523807067. The cubic root of 72126843 is about 416.2609213558.

The spelling of 72126843 in words is "seventy-two million, one hundred twenty-six thousand, eight hundred forty-three".