420869389 has 2 divisors, whose sum is σ = 420869390. Its totient is φ = 420869388.

The previous prime is 420869359. The next prime is 420869401. The reversal of 420869389 is 983968024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 414326025 + 6543364 = 20355^2 + 2558^2 .

It is a cyclic number.

It is not a de Polignac number, because 420869389 - 2¹⁷ = 420738317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420869359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210434694 + 210434695.

It is an arithmetic number, because the mean of its divisors is an integer number (210434695).

Almost surely, 2^420869389 is an apocalyptic number.

It is an amenable number.

420869389 is a deficient number, since it is larger than the sum of its proper divisors (1).

420869389 is an equidigital number, since it uses as much as digits as its factorization.

420869389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 49.

The square root of 420869389 is about 20515.1014864660. The cubic root of 420869389 is about 749.4036082519.

The spelling of 420869389 in words is "four hundred twenty million, eight hundred sixty-nine thousand, three hundred eighty-nine".