421343389 has 2 divisors, whose sum is σ = 421343390. Its totient is φ = 421343388.

The previous prime is 421343357. The next prime is 421343431. The reversal of 421343389 is 983343124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358458489 + 62884900 = 18933^2 + 7930^2 .

It is a cyclic number.

It is not a de Polignac number, because 421343389 - 2⁵ = 421343357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421340389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210671694 + 210671695.

It is an arithmetic number, because the mean of its divisors is an integer number (210671695).

Almost surely, 2^421343389 is an apocalyptic number.

It is an amenable number.

421343389 is a deficient number, since it is larger than the sum of its proper divisors (1).

421343389 is an equidigital number, since it uses as much as digits as its factorization.

421343389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 421343389 is about 20526.6507009790. The cubic root of 421343389 is about 749.6848388424.

It can be divided in two parts, 42 and 1343389, that added together give a palindrome (1343431).

The spelling of 421343389 in words is "four hundred twenty-one million, three hundred forty-three thousand, three hundred eighty-nine".