421589407 has 2 divisors, whose sum is σ = 421589408. Its totient is φ = 421589406.

The previous prime is 421589369. The next prime is 421589417. The reversal of 421589407 is 704985124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421589407 - 2¹⁹ = 421065119 is a prime.

It is a super-2 number, since 2×421589407² = 355475256189223298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421589407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421589417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210794703 + 210794704.

It is an arithmetic number, because the mean of its divisors is an integer number (210794704).

Almost surely, 2^421589407 is an apocalyptic number.

421589407 is a deficient number, since it is larger than the sum of its proper divisors (1).

421589407 is an equidigital number, since it uses as much as digits as its factorization.

421589407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 421589407 is about 20532.6424748497. The cubic root of 421589407 is about 749.8307214996.

The spelling of 421589407 in words is "four hundred twenty-one million, five hundred eighty-nine thousand, four hundred seven".