189409873 has 8 divisors (see below), whose sum is σ = 194213376. Its totient is φ = 184615200.

The previous prime is 189409849. The next prime is 189409877. The reversal of 189409873 is 378904981.

It is a happy number.

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 189409873 - 2⁹ = 189409361 is a prime.

It is a super-2 number, since 2×189409873² = 71752199979752258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189409877) 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, 71808 + ... + 74398.

It is an arithmetic number, because the mean of its divisors is an integer number (24276672).

Almost surely, 2^189409873 is an apocalyptic number.

It is an amenable number.

189409873 is a deficient number, since it is larger than the sum of its proper divisors (4803503).

189409873 is a wasteful number, since it uses less digits than its factorization.

189409873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 189409873 is about 13762.6259485608. The cubic root of 189409873 is about 574.2939012571.

The spelling of 189409873 in words is "one hundred eighty-nine million, four hundred nine thousand, eight hundred seventy-three".