189897473 has 8 divisors (see below), whose sum is σ = 192288360. Its totient is φ = 187516800.

The previous prime is 189897427. The next prime is 189897479. The reversal of 189897473 is 374798981.

It can be written as a sum of positive squares in 4 ways, for example, as 73753744 + 116143729 = 8588^2 + 10777^2 .

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 189897473 - 2⁸ = 189897217 is a prime.

It is a super-2 number, since 2×189897473² = 72122100503571458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189897479) 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, 39011 + ... + 43607.

It is an arithmetic number, because the mean of its divisors is an integer number (24036045).

Almost surely, 2^189897473 is an apocalyptic number.

It is an amenable number.

189897473 is a deficient number, since it is larger than the sum of its proper divisors (2390887).

189897473 is a wasteful number, since it uses less digits than its factorization.

189897473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107.

The product of its digits is 3048192, while the sum is 56.

The square root of 189897473 is about 13780.3292050662. The cubic root of 189897473 is about 574.7862827678.

It can be divided in two parts, 18989 and 7473, that added together give a palindrome (26462).

The spelling of 189897473 in words is "one hundred eighty-nine million, eight hundred ninety-seven thousand, four hundred seventy-three".