205402 has 4 divisors (see below), whose sum is σ = 308106. Its totient is φ = 102700.
The previous prime is 205399. The next prime is 205417. The reversal of 205402 is 204502.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204502 = 2 ⋅102251.
It can be written as a sum of positive squares in only one way, i.e., 168921 + 36481 = 411^2 + 191^2 .
It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51349 + ... + 51352.
2205402 is an apocalyptic number.
205402 is a deficient number, since it is larger than the sum of its proper divisors (102704).
205402 is a wasteful number, since it uses less digits than its factorization.
205402 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 102703.
The product of its (nonzero) digits is 80, while the sum is 13.
The square root of 205402 is about 453.2129742185. The cubic root of 205402 is about 59.0022023500.
Adding to 205402 its reverse (204502), we get a palindrome (409904).
Subtracting from 205402 its reverse (204502), we obtain a square (900 = 302).
The spelling of 205402 in words is "two hundred five thousand, four hundred two".
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