189901247 has 4 divisors (see below), whose sum is σ = 189969696. Its totient is φ = 189832800.

The previous prime is 189901223. The next prime is 189901259. The reversal of 189901247 is 742109981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742109981 = 2393 ⋅310117.

It is a cyclic number.

It is not a de Polignac number, because 189901247 - 2⁶ = 189901183 is a prime.

It is a super-2 number, since 2×189901247² = 72124967224310018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189901277) 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, 29879 + ... + 35672.

It is an arithmetic number, because the mean of its divisors is an integer number (47492424).

Almost surely, 2^189901247 is an apocalyptic number.

189901247 is a deficient number, since it is larger than the sum of its proper divisors (68449).

189901247 is an equidigital number, since it uses as much as digits as its factorization.

189901247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68448.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 189901247 is about 13780.4661387052. The cubic root of 189901247 is about 574.7900904875.

The spelling of 189901247 in words is "one hundred eighty-nine million, nine hundred one thousand, two hundred forty-seven".