421475389 has 2 divisors, whose sum is σ = 421475390. Its totient is φ = 421475388.

The previous prime is 421475381. The next prime is 421475419. The reversal of 421475389 is 983574124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 287031364 + 134444025 = 16942^2 + 11595^2 .

It is a cyclic number.

It is not a de Polignac number, because 421475389 - 2³ = 421475381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421475381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210737694 + 210737695.

It is an arithmetic number, because the mean of its divisors is an integer number (210737695).

Almost surely, 2^421475389 is an apocalyptic number.

It is an amenable number.

421475389 is a deficient number, since it is larger than the sum of its proper divisors (1).

421475389 is an equidigital number, since it uses as much as digits as its factorization.

421475389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 421475389 is about 20529.8657813440. The cubic root of 421475389 is about 749.7631186723.

The spelling of 421475389 in words is "four hundred twenty-one million, four hundred seventy-five thousand, three hundred eighty-nine".