43128723 has 16 divisors (see below), whose sum is σ = 62969472. Its totient is φ = 26040000.

The previous prime is 43128671. The next prime is 43128731. The reversal of 43128723 is 32782134.

It is not a de Polignac number, because 43128723 - 2⁸ = 43128467 is a prime.

It is a super-2 number, since 2×43128723² = 3720173495221458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43128733) 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, 6948 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (3935592).

Almost surely, 2^43128723 is an apocalyptic number.

43128723 is a deficient number, since it is larger than the sum of its proper divisors (19840749).

43128723 is a wasteful number, since it uses less digits than its factorization.

43128723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946.

The product of its digits is 8064, while the sum is 30.

The square root of 43128723 is about 6567.2462265397. The cubic root of 43128723 is about 350.6890453068.

The spelling of 43128723 in words is "forty-three million, one hundred twenty-eight thousand, seven hundred twenty-three".