189503781 has 8 divisors (see below), whose sum is σ = 252769440. Its totient is φ = 126286992.

The previous prime is 189503773. The next prime is 189503791. The reversal of 189503781 is 187305981.

189503781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189503781 - 2³ = 189503773 is a prime.

It is a super-2 number, since 2×189503781² = 71823366026591922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189503711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1930 + ... + 19563.

It is an arithmetic number, because the mean of its divisors is an integer number (31596180).

Almost surely, 2^189503781 is an apocalyptic number.

It is an amenable number.

189503781 is a deficient number, since it is larger than the sum of its proper divisors (63265659).

189503781 is a wasteful number, since it uses less digits than its factorization.

189503781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24435.

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 189503781 is about 13766.0372293554. The cubic root of 189503781 is about 574.3887957848.

The spelling of 189503781 in words is "one hundred eighty-nine million, five hundred three thousand, seven hundred eighty-one".