365421 has 8 divisors (see below), whose sum is σ = 556864. Its totient is φ = 208800.

The previous prime is 365419. The next prime is 365423. The reversal of 365421 is 124563.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (365419) and next prime (365423).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 365421 - 2¹ = 365419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 17401 = 365421 / (3 + 6 + 5 + 4 + 2 + 1).

It is the 605-th Hogben number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 365421.

It is not an unprimeable number, because it can be changed into a prime (365423) by changing a digit.

It is a nontrivial repunit in base 604.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8680 + ... + 8721.

It is an arithmetic number, because the mean of its divisors is an integer number (69608).

2³⁶⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

365421 is a deficient number, since it is larger than the sum of its proper divisors (191443).

365421 is a wasteful number, since it uses less digits than its factorization.

365421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17411.

The product of its digits is 720, while the sum is 21.

The square root of 365421 is about 604.5006203471. The cubic root of 365421 is about 71.4931611957.

Adding to 365421 its reverse (124563), we get a palindrome (489984).

The spelling of 365421 in words is "three hundred sixty-five thousand, four hundred twenty-one".