189689690 has 8 divisors (see below), whose sum is σ = 341441460. Its totient is φ = 75875872.

The previous prime is 189689681. The next prime is 189689693. The reversal of 189689690 is 96986981.

It can be written as a sum of positive squares in 2 ways, for example, as 189585361 + 104329 = 13769^2 + 323^2 .

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

It is a super-2 number, since 2×189689690² = 71964356984592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (189689693) 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 3 ways as a sum of consecutive naturals, for example, 9484475 + ... + 9484494.

Almost surely, 2^189689690 is an apocalyptic number.

189689690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189689690 is a deficient number, since it is larger than the sum of its proper divisors (151751770).

189689690 is a wasteful number, since it uses less digits than its factorization.

189689690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18968976.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 189689690 is about 13772.7880256686. The cubic root of 189689690 is about 574.5765653825.

The spelling of 189689690 in words is "one hundred eighty-nine million, six hundred eighty-nine thousand, six hundred ninety".