189947724 has 12 divisors (see below), whose sum is σ = 443211384. Its totient is φ = 63315904.

The previous prime is 189947699. The next prime is 189947729. The reversal of 189947724 is 427749981.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (189947729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7914477 + ... + 7914500.

It is an arithmetic number, because the mean of its divisors is an integer number (36934282).

Almost surely, 2^189947724 is an apocalyptic number.

It is an amenable number.

189947724 is an abundant number, since it is smaller than the sum of its proper divisors (253263660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

189947724 is a wasteful number, since it uses less digits than its factorization.

189947724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15828984 (or 15828982 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 189947724 is about 13782.1523718177. The cubic root of 189947724 is about 574.8369786120.

The spelling of 189947724 in words is "one hundred eighty-nine million, nine hundred forty-seven thousand, seven hundred twenty-four".