189237749 has 2 divisors, whose sum is σ = 189237750. Its totient is φ = 189237748.

The previous prime is 189237743. The next prime is 189237757. The reversal of 189237749 is 947732981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124322500 + 64915249 = 11150^2 + 8057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189237749 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 189237697 and 189237706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189237743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94618874 + 94618875.

It is an arithmetic number, because the mean of its divisors is an integer number (94618875).

Almost surely, 2^189237749 is an apocalyptic number.

It is an amenable number.

189237749 is a deficient number, since it is larger than the sum of its proper divisors (1).

189237749 is an equidigital number, since it uses as much as digits as its factorization.

189237749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 189237749 is about 13756.3712148226. The cubic root of 189237749 is about 574.1198875871.

The spelling of 189237749 in words is "one hundred eighty-nine million, two hundred thirty-seven thousand, seven hundred forty-nine".