102005444 has 6 divisors (see below), whose sum is σ = 178509534. Its totient is φ = 51002720.

The previous prime is 102005413. The next prime is 102005447. The reversal of 102005444 is 444500201.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 28217344 = 8590^2 + 5312^2 .

It is a super-2 number, since 2×102005444² = 20810221211274272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (102005447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12750677 + ... + 12750684.

It is an arithmetic number, because the mean of its divisors is an integer number (29751589).

Almost surely, 2^102005444 is an apocalyptic number.

It is an amenable number.

102005444 is a deficient number, since it is larger than the sum of its proper divisors (76504090).

102005444 is a wasteful number, since it uses less digits than its factorization.

102005444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25501365 (or 25501363 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 102005444 is about 10099.7744529272. The cubic root of 102005444 is about 467.2411851574.

Adding to 102005444 its reverse (444500201), we get a palindrome (546505645).

The spelling of 102005444 in words is "one hundred two million, five thousand, four hundred forty-four".