188914639 has 2 divisors, whose sum is σ = 188914640. Its totient is φ = 188914638.

The previous prime is 188914633. The next prime is 188914699. The reversal of 188914639 is 936419881.

It is a weak prime.

It is an emirp because it is prime and its reverse (936419881) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188914639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 188914592 and 188914601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188914633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94457319 + 94457320.

It is an arithmetic number, because the mean of its divisors is an integer number (94457320).

Almost surely, 2^188914639 is an apocalyptic number.

188914639 is a deficient number, since it is larger than the sum of its proper divisors (1).

188914639 is an equidigital number, since it uses as much as digits as its factorization.

188914639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 188914639 is about 13744.6221846946. The cubic root of 188914639 is about 573.7929451450.

The spelling of 188914639 in words is "one hundred eighty-eight million, nine hundred fourteen thousand, six hundred thirty-nine".