138187963 has 2 divisors, whose sum is σ = 138187964. Its totient is φ = 138187962.

The previous prime is 138187949. The next prime is 138187967. The reversal of 138187963 is 369781831.

138187963 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138187963 - 2²¹ = 136090811 is a prime.

It is not a weakly prime, because it can be changed into another prime (138187967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69093981 + 69093982.

It is an arithmetic number, because the mean of its divisors is an integer number (69093982).

Almost surely, 2^138187963 is an apocalyptic number.

138187963 is a deficient number, since it is larger than the sum of its proper divisors (1).

138187963 is an equidigital number, since it uses as much as digits as its factorization.

138187963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 138187963 is about 11755.3376387069. The cubic root of 138187963 is about 516.9994388091. Note that the first 3 decimals are identical.

The spelling of 138187963 in words is "one hundred thirty-eight million, one hundred eighty-seven thousand, nine hundred sixty-three".