421438873 has 2 divisors, whose sum is σ = 421438874. Its totient is φ = 421438872.

The previous prime is 421438859. The next prime is 421438883. The reversal of 421438873 is 378834124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401080729 + 20358144 = 20027^2 + 4512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421438873 is a prime.

It is a super-2 number, since 2×421438873² = 355221447351020258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421438883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210719436 + 210719437.

It is an arithmetic number, because the mean of its divisors is an integer number (210719437).

Almost surely, 2^421438873 is an apocalyptic number.

It is an amenable number.

421438873 is a deficient number, since it is larger than the sum of its proper divisors (1).

421438873 is an equidigital number, since it uses as much as digits as its factorization.

421438873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 40.

The square root of 421438873 is about 20528.9764235824. The cubic root of 421438873 is about 749.7414652603.

The spelling of 421438873 in words is "four hundred twenty-one million, four hundred thirty-eight thousand, eight hundred seventy-three".