1223400543 has 4 divisors (see below), whose sum is σ = 1631200728. Its totient is φ = 815600360.

The previous prime is 1223400533. The next prime is 1223400551. The reversal of 1223400543 is 3450043221.

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 1223400543 - 2¹⁴ = 1223384159 is a prime.

It is a super-2 number, since 2×1223400543² = 2993417777225389698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223400533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203900088 + ... + 203900093.

It is an arithmetic number, because the mean of its divisors is an integer number (407800182).

Almost surely, 2^1223400543 is an apocalyptic number.

1223400543 is a deficient number, since it is larger than the sum of its proper divisors (407800185).

1223400543 is an equidigital number, since it uses as much as digits as its factorization.

1223400543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407800184.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 1223400543 is about 34977.1431509207. The cubic root of 1223400543 is about 1069.5215909454.

Adding to 1223400543 its reverse (3450043221), we get a palindrome (4673443764).

The spelling of 1223400543 in words is "one billion, two hundred twenty-three million, four hundred thousand, five hundred forty-three".