365993 has 4 divisors (see below), whose sum is σ = 387540. Its totient is φ = 344448.

The previous prime is 365983. The next prime is 366001. The reversal of 365993 is 399563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399563 = 37 ⋅10799.

It can be written as a sum of positive squares in 2 ways, for example, as 169744 + 196249 = 412^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 365993 - 2⁶ = 365929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (365903) 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, 10748 + ... + 10781.

It is an arithmetic number, because the mean of its divisors is an integer number (96885).

2³⁶⁵⁹⁹³ is an apocalyptic number.

It is an amenable number.

365993 is a deficient number, since it is larger than the sum of its proper divisors (21547).

365993 is a wasteful number, since it uses less digits than its factorization.

365993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21546.

The product of its digits is 21870, while the sum is 35.

The square root of 365993 is about 604.9735531410. The cubic root of 365993 is about 71.5304449217.

The spelling of 365993 in words is "three hundred sixty-five thousand, nine hundred ninety-three".