189817953 has 16 divisors (see below), whose sum is σ = 278900160. Its totient is φ = 114093504.

The previous prime is 189817951. The next prime is 189817993. The reversal of 189817953 is 359718981.

It is not a de Polignac number, because 189817953 - 2¹ = 189817951 is a prime.

It is a super-2 number, since 2×189817953² = 72061710562220418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 189817896 and 189817905.

It is not an unprimeable number, because it can be changed into a prime (189817951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54918 + ... + 58271.

It is an arithmetic number, because the mean of its divisors is an integer number (17431260).

Almost surely, 2^189817953 is an apocalyptic number.

189817953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

189817953 is a deficient number, since it is larger than the sum of its proper divisors (89082207).

189817953 is a wasteful number, since it uses less digits than its factorization.

189817953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113248.

The product of its digits is 544320, while the sum is 51.

The square root of 189817953 is about 13777.4436308047. The cubic root of 189817953 is about 574.7060405438.

The spelling of 189817953 in words is "one hundred eighty-nine million, eight hundred seventeen thousand, nine hundred fifty-three".