421497 has 16 divisors (see below), whose sum is σ = 636480. Its totient is φ = 275616.

The previous prime is 421493. The next prime is 421501. The reversal of 421497 is 794124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421493) and next prime (421501).

It is not a de Polignac number, because 421497 - 2² = 421493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 421497.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1693 + ... + 1925.

It is an arithmetic number, because the mean of its divisors is an integer number (39780).

2⁴²¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

421497 is a deficient number, since it is larger than the sum of its proper divisors (214983).

421497 is a wasteful number, since it uses less digits than its factorization.

421497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 421497 is about 649.2280030929. The cubic root of 421497 is about 74.9775933065.

The spelling of 421497 in words is "four hundred twenty-one thousand, four hundred ninety-seven".