421540343 has 8 divisors (see below), whose sum is σ = 502706688. Its totient is φ = 345610584.

The previous prime is 421540337. The next prime is 421540351. The reversal of 421540343 is 343045124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421540343 - 2¹⁰ = 421539319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421540333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1308971 + ... + 1309292.

It is an arithmetic number, because the mean of its divisors is an integer number (62838336).

Almost surely, 2^421540343 is an apocalyptic number.

421540343 is a deficient number, since it is larger than the sum of its proper divisors (81166345).

421540343 is a wasteful number, since it uses less digits than its factorization.

421540343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618293.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 421540343 is about 20531.4476596269. The cubic root of 421540343 is about 749.8016322790.

Adding to 421540343 its reverse (343045124), we get a palindrome (764585467).

The spelling of 421540343 in words is "four hundred twenty-one million, five hundred forty thousand, three hundred forty-three".