138900947 has 2 divisors, whose sum is σ = 138900948. Its totient is φ = 138900946.

The previous prime is 138900943. The next prime is 138900961. The reversal of 138900947 is 749009831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138900947 - 2² = 138900943 is a prime.

It is not a weakly prime, because it can be changed into another prime (138900941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69450473 + 69450474.

It is an arithmetic number, because the mean of its divisors is an integer number (69450474).

Almost surely, 2^138900947 is an apocalyptic number.

138900947 is a deficient number, since it is larger than the sum of its proper divisors (1).

138900947 is an equidigital number, since it uses as much as digits as its factorization.

138900947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 138900947 is about 11785.6245910007. The cubic root of 138900947 is about 517.8870708339.

The spelling of 138900947 in words is "one hundred thirty-eight million, nine hundred thousand, nine hundred forty-seven".