202142809 has 8 divisors (see below), whose sum is σ = 220825152. Its totient is φ = 183511440.

The previous prime is 202142771. The next prime is 202142821. The reversal of 202142809 is 908241202.

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 202142809 - 2¹³ = 202134617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202142849) 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, 4194 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (27603144).

Almost surely, 2^202142809 is an apocalyptic number.

It is an amenable number.

202142809 is a deficient number, since it is larger than the sum of its proper divisors (18682343).

202142809 is a wasteful number, since it uses less digits than its factorization.

202142809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25487.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 202142809 is about 14217.6935189925. The cubic root of 202142809 is about 586.8846700065.

The spelling of 202142809 in words is "two hundred two million, one hundred forty-two thousand, eight hundred nine".