189905357 has 2 divisors, whose sum is σ = 189905358. Its totient is φ = 189905356.

The previous prime is 189905327. The next prime is 189905363. The reversal of 189905357 is 753509981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181413961 + 8491396 = 13469^2 + 2914^2 .

It is a cyclic number.

It is not a de Polignac number, because 189905357 - 2⁶ = 189905293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189905327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94952678 + 94952679.

It is an arithmetic number, because the mean of its divisors is an integer number (94952679).

Almost surely, 2^189905357 is an apocalyptic number.

It is an amenable number.

189905357 is a deficient number, since it is larger than the sum of its proper divisors (1).

189905357 is an equidigital number, since it uses as much as digits as its factorization.

189905357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 47.

The square root of 189905357 is about 13780.6152620266. The cubic root of 189905357 is about 574.7942371519.

The spelling of 189905357 in words is "one hundred eighty-nine million, nine hundred five thousand, three hundred fifty-seven".