23456543 has 16 divisors (see below), whose sum is σ = 26497152. Its totient is φ = 20580000.

The previous prime is 23456539. The next prime is 23456561. The reversal of 23456543 is 34565432.

23456543 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a cyclic number.

It is not a de Polignac number, because 23456543 - 2² = 23456539 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23456143) 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, 47528 + ... + 48018.

It is an arithmetic number, because the mean of its divisors is an integer number (1656072).

Almost surely, 2^23456543 is an apocalyptic number.

23456543 is a deficient number, since it is larger than the sum of its proper divisors (3040609).

23456543 is a wasteful number, since it uses less digits than its factorization.

23456543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its digits is 43200, while the sum is 32.

The square root of 23456543 is about 4843.1955360072. The cubic root of 23456543 is about 286.2560464770.

Subtracting 23456543 from its reverse (34565432), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2345 and 6543, that added together give a palindrome (8888).

The spelling of 23456543 in words is "twenty-three million, four hundred fifty-six thousand, five hundred forty-three".