138870899 has 2 divisors, whose sum is σ = 138870900. Its totient is φ = 138870898.

The previous prime is 138870889. The next prime is 138870929. The reversal of 138870899 is 998078831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138870899 - 2¹² = 138866803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138870899.

It is not a weakly prime, because it can be changed into another prime (138870839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69435449 + 69435450.

It is an arithmetic number, because the mean of its divisors is an integer number (69435450).

Almost surely, 2^138870899 is an apocalyptic number.

138870899 is a deficient number, since it is larger than the sum of its proper divisors (1).

138870899 is an equidigital number, since it uses as much as digits as its factorization.

138870899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 53.

The square root of 138870899 is about 11784.3497487133. The cubic root of 138870899 is about 517.8497238532.

The spelling of 138870899 in words is "one hundred thirty-eight million, eight hundred seventy thousand, eight hundred ninety-nine".