189938772 has 18 divisors (see below), whose sum is σ = 480123098. Its totient is φ = 63312912.

The previous prime is 189938741. The next prime is 189938809. The reversal of 189938772 is 277839981.

It can be written as a sum of positive squares in only one way, i.e., 165791376 + 24147396 = 12876^2 + 4914^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2638003 + ... + 2638074.

Almost surely, 2^189938772 is an apocalyptic number.

189938772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

189938772 is an abundant number, since it is smaller than the sum of its proper divisors (290184326).

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

189938772 is a wasteful number, since it uses less digits than its factorization.

189938772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5276087 (or 5276082 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 54.

The square root of 189938772 is about 13781.8276001407. The cubic root of 189938772 is about 574.8279480195.

It can be divided in two parts, 189 and 938772, that added together give a square (938961 = 969²).

The spelling of 189938772 in words is "one hundred eighty-nine million, nine hundred thirty-eight thousand, seven hundred seventy-two".