421958417 has 4 divisors (see below), whose sum is σ = 422169636. Its totient is φ = 421747200.

The previous prime is 421958393. The next prime is 421958423. The reversal of 421958417 is 714859124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 245360896 + 176597521 = 15664^2 + 13289^2 .

It is a cyclic number.

It is not a de Polignac number, because 421958417 - 2⁶ = 421958353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421958447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102584 + ... + 106617.

It is an arithmetic number, because the mean of its divisors is an integer number (105542409).

Almost surely, 2^421958417 is an apocalyptic number.

It is an amenable number.

421958417 is a deficient number, since it is larger than the sum of its proper divisors (211219).

421958417 is a wasteful number, since it uses less digits than its factorization.

421958417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211218.

The product of its digits is 80640, while the sum is 41.

The square root of 421958417 is about 20541.6264448558. The cubic root of 421958417 is about 750.0494290386.

The spelling of 421958417 in words is "four hundred twenty-one million, nine hundred fifty-eight thousand, four hundred seventeen".