201909389 has 4 divisors (see below), whose sum is σ = 220264800. Its totient is φ = 183553980.

The previous prime is 201909377. The next prime is 201909419. The reversal of 201909389 is 983909102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201909389 - 2⁴ = 201909373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201909319) 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 3 ways as a sum of consecutive naturals, for example, 9177689 + ... + 9177710.

It is an arithmetic number, because the mean of its divisors is an integer number (55066200).

Almost surely, 2^201909389 is an apocalyptic number.

It is an amenable number.

201909389 is a deficient number, since it is larger than the sum of its proper divisors (18355411).

201909389 is a wasteful number, since it uses less digits than its factorization.

201909389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18355410.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 201909389 is about 14209.4823621411. The cubic root of 201909389 is about 586.6586855764.

The spelling of 201909389 in words is "two hundred one million, nine hundred nine thousand, three hundred eighty-nine".