189389487 has 8 divisors (see below), whose sum is σ = 288593536. Its totient is φ = 108222552.

The previous prime is 189389479. The next prime is 189389491. The reversal of 189389487 is 784983981.

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

It is not a de Polignac number, because 189389487 - 2³ = 189389479 is a prime.

It is a super-2 number, since 2×189389487² = 71736755572246338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189389407) 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, 4509253 + ... + 4509294.

It is an arithmetic number, because the mean of its divisors is an integer number (36074192).

Almost surely, 2^189389487 is an apocalyptic number.

189389487 is a deficient number, since it is larger than the sum of its proper divisors (99204049).

189389487 is an equidigital number, since it uses as much as digits as its factorization.

189389487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9018557.

The product of its digits is 3483648, while the sum is 57.

The square root of 189389487 is about 13761.8852996237. The cubic root of 189389487 is about 574.2732969536.

It can be divided in two parts, 1893894 and 87, that added together give a palindrome (1893981).

The spelling of 189389487 in words is "one hundred eighty-nine million, three hundred eighty-nine thousand, four hundred eighty-seven".