420000043 has 4 divisors (see below), whose sum is σ = 420911568. Its totient is φ = 419088520.

The previous prime is 420000029. The next prime is 420000101. The reversal of 420000043 is 340000024.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420000043 is a prime.

It is a super-2 number, since 2×420000043² = 352800072240003698, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 419999978 and 420000032.

It is not an unprimeable number, because it can be changed into a prime (420000443) 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, 455071 + ... + 455992.

It is an arithmetic number, because the mean of its divisors is an integer number (105227892).

Almost surely, 2^420000043 is an apocalyptic number.

420000043 is a deficient number, since it is larger than the sum of its proper divisors (911525).

420000043 is an equidigital number, since it uses as much as digits as its factorization.

420000043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911524.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 420000043 is about 20493.9025810117. The cubic root of 420000043 is about 748.8872642791.

Adding to 420000043 its reverse (340000024), we get a palindrome (760000067).

The spelling of 420000043 in words is "four hundred twenty million, forty-three", and thus it is an aban number.