205402145 has 8 divisors (see below), whose sum is σ = 265442856. Its totient is φ = 151681536.

The previous prime is 205402117. The next prime is 205402147. The reversal of 205402145 is 541204502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 45859984 + 159542161 = 6772^2 + 12631^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 205402145 - 2⁶ = 205402081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205402145.

It is not an unprimeable number, because it can be changed into a prime (205402147) by changing a digit.

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, 1579952 + ... + 1580081.

It is an arithmetic number, because the mean of its divisors is an integer number (33180357).

Almost surely, 2^205402145 is an apocalyptic number.

It is an amenable number.

205402145 is a deficient number, since it is larger than the sum of its proper divisors (60040711).

205402145 is a wasteful number, since it uses less digits than its factorization.

205402145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3160051.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 205402145 is about 14331.8576953583. The cubic root of 205402145 is about 590.0221623390.

Adding to 205402145 its reverse (541204502), we get a palindrome (746606647).

The spelling of 205402145 in words is "two hundred five million, four hundred two thousand, one hundred forty-five".