1897222909 has 8 divisors (see below), whose sum is σ = 2003969792. Its totient is φ = 1793322720.

The previous prime is 1897222897. The next prime is 1897222913. The reversal of 1897222909 is 9092227981.

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

It is not a de Polignac number, because 1897222909 - 2¹³ = 1897214717 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 (1897222309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710304 + ... + 712969.

It is an arithmetic number, because the mean of its divisors is an integer number (250496224).

Almost surely, 2^1897222909 is an apocalyptic number.

It is an amenable number.

1897222909 is a deficient number, since it is larger than the sum of its proper divisors (106746883).

1897222909 is a wasteful number, since it uses less digits than its factorization.

1897222909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423347.

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 1897222909 is about 43557.1223682190. The cubic root of 1897222909 is about 1237.9585967416.

The spelling of 1897222909 in words is "one billion, eight hundred ninety-seven million, two hundred twenty-two thousand, nine hundred nine".