102040209 has 8 divisors (see below), whose sum is σ = 151170720. Its totient is φ = 68026788.

The previous prime is 102040201. The next prime is 102040231. The reversal of 102040209 is 902040201.

It is not a de Polignac number, because 102040209 - 2³ = 102040201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102040191 and 102040200.

It is not an unprimeable number, because it can be changed into a prime (102040201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1889607 + ... + 1889660.

It is an arithmetic number, because the mean of its divisors is an integer number (18896340).

Almost surely, 2^102040209 is an apocalyptic number.

It is an amenable number.

102040209 is a deficient number, since it is larger than the sum of its proper divisors (49130511).

102040209 is an equidigital number, since it uses as much as digits as its factorization.

102040209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3779276 (or 3779270 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 102040209 is about 10101.4953843478. The cubic root of 102040209 is about 467.2942600855.

The spelling of 102040209 in words is "one hundred two million, forty thousand, two hundred nine".