421597 has 4 divisors (see below), whose sum is σ = 459936. Its totient is φ = 383260.

The previous prime is 421559. The next prime is 421607. The reversal of 421597 is 795124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421597 - 2⁷ = 421469 is a prime.

It is a Duffinian number.

421597 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19153 + ... + 19174.

It is an arithmetic number, because the mean of its divisors is an integer number (114984).

2⁴²¹⁵⁹⁷ is an apocalyptic number.

It is an amenable number.

421597 is a deficient number, since it is larger than the sum of its proper divisors (38339).

421597 is a wasteful number, since it uses less digits than its factorization.

421597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38338.

The product of its digits is 2520, while the sum is 28.

The square root of 421597 is about 649.3050130717. The cubic root of 421597 is about 74.9835223060.

The spelling of 421597 in words is "four hundred twenty-one thousand, five hundred ninety-seven".