200045 has 4 divisors (see below), whose sum is σ = 240060. Its totient is φ = 160032.

The previous prime is 200041. The next prime is 200063. The reversal of 200045 is 540002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 540002 = 2 ⋅270001.

It can be written as a sum of positive squares in 2 ways, for example, as 157609 + 42436 = 397^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 200045 - 2² = 200041 is a prime.

200045 is a modest number, since divided by 45 gives 20 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 199999 and 200035.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200041) 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, 20000 + ... + 20009.

It is an arithmetic number, because the mean of its divisors is an integer number (60015).

2²⁰⁰⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

200045 is a deficient number, since it is larger than the sum of its proper divisors (40015).

200045 is an equidigital number, since it uses as much as digits as its factorization.

200045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40014.

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 200045 is about 447.2639041997. The cubic root of 200045 is about 58.4847404620.

Adding to 200045 its reverse (540002), we get a palindrome (740047).

It can be divided in two parts, 2000 and 45, that multiplied together give a square (90000 = 300²).

The spelling of 200045 in words is "two hundred thousand, forty-five".