189995247 has 48 divisors (see below), whose sum is σ = 322178080. Its totient is φ = 109983744.

The previous prime is 189995243. The next prime is 189995257. The reversal of 189995247 is 742599981.

It is not a de Polignac number, because 189995247 - 2² = 189995243 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189995193 and 189995202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189995243) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100503 + ... + 102375.

Almost surely, 2^189995247 is an apocalyptic number.

189995247 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

189995247 is a deficient number, since it is larger than the sum of its proper divisors (132182833).

189995247 is a wasteful number, since it uses less digits than its factorization.

189995247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1906 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 189995247 is about 13783.8763415811. The cubic root of 189995247 is about 574.8849140812.

The spelling of 189995247 in words is "one hundred eighty-nine million, nine hundred ninety-five thousand, two hundred forty-seven".