1243420043 has 16 divisors (see below), whose sum is σ = 1316044800. Its totient is φ = 1172467296.

The previous prime is 1243420033. The next prime is 1243420067. The reversal of 1243420043 is 3400243421.

It is a cyclic number.

It is not a de Polignac number, because 1243420043 - 2¹⁰ = 1243419019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243420033) 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, 486533 + ... + 489081.

It is an arithmetic number, because the mean of its divisors is an integer number (82252800).

Almost surely, 2^1243420043 is an apocalyptic number.

1243420043 is a deficient number, since it is larger than the sum of its proper divisors (72624757).

1243420043 is a wasteful number, since it uses less digits than its factorization.

1243420043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2866.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 1243420043 is about 35262.1616325488. The cubic root of 1243420043 is about 1075.3238737140.

Adding to 1243420043 its reverse (3400243421), we get a palindrome (4643663464).

The spelling of 1243420043 in words is "one billion, two hundred forty-three million, four hundred twenty thousand, forty-three".