369921 has 4 divisors (see below), whose sum is σ = 493232. Its totient is φ = 246612.

The previous prime is 369917. The next prime is 369947. The reversal of 369921 is 129963.

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, and also an emirpimes, since its reverse is a distinct semiprime: 129963 = 3 ⋅43321.

It is not a de Polignac number, because 369921 - 2² = 369917 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 369921.

It is not an unprimeable number, because it can be changed into a prime (369961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61651 + ... + 61656.

It is an arithmetic number, because the mean of its divisors is an integer number (123308).

2³⁶⁹⁹²¹ is an apocalyptic number.

It is an amenable number.

369921 is a deficient number, since it is larger than the sum of its proper divisors (123311).

369921 is a wasteful number, since it uses less digits than its factorization.

369921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123310.

The product of its digits is 2916, while the sum is 30.

The square root of 369921 is about 608.2113119632. The cubic root of 369921 is about 71.7854337399.

The spelling of 369921 in words is "three hundred sixty-nine thousand, nine hundred twenty-one".