189902281 has 8 divisors (see below), whose sum is σ = 191640384. Its totient is φ = 188170800.

The previous prime is 189902267. The next prime is 189902299. The reversal of 189902281 is 182209981.

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 189902281 - 2¹⁷ = 189771209 is a prime.

It is a super-2 number, since 2×189902281² = 72125752658005922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189902081) 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, 69171 + ... + 71863.

It is an arithmetic number, because the mean of its divisors is an integer number (23955048).

Almost surely, 2^189902281 is an apocalyptic number.

It is an amenable number.

189902281 is a deficient number, since it is larger than the sum of its proper divisors (1738103).

189902281 is a wasteful number, since it uses less digits than its factorization.

189902281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 189902281 is about 13780.5036555273. The cubic root of 189902281 is about 574.7911337172.

The spelling of 189902281 in words is "one hundred eighty-nine million, nine hundred two thousand, two hundred eighty-one".