138801889 has 4 divisors (see below), whose sum is σ = 146966724. Its totient is φ = 130637056.

The previous prime is 138801877. The next prime is 138801899. The reversal of 138801889 is 988108831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988108831 = 67 ⋅14747893.

It can be written as a sum of positive squares in 2 ways, for example, as 106254864 + 32547025 = 10308^2 + 5705^2 .

It is a cyclic number.

It is not a de Polignac number, because 138801889 - 2¹¹ = 138799841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138801829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4082392 + ... + 4082425.

It is an arithmetic number, because the mean of its divisors is an integer number (36741681).

Almost surely, 2^138801889 is an apocalyptic number.

It is an amenable number.

138801889 is a deficient number, since it is larger than the sum of its proper divisors (8164835).

138801889 is an equidigital number, since it uses as much as digits as its factorization.

138801889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8164834.

The product of its (nonzero) digits is 110592, while the sum is 46.

The square root of 138801889 is about 11781.4213488866. The cubic root of 138801889 is about 517.7639301868.

The spelling of 138801889 in words is "one hundred thirty-eight million, eight hundred one thousand, eight hundred eighty-nine".