138801861 has 24 divisors (see below), whose sum is σ = 219142560. Its totient is φ = 83959200.

The previous prime is 138801853. The next prime is 138801863. The reversal of 138801861 is 168108831.

It is not a de Polignac number, because 138801861 - 2³ = 138801853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138801863) 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 23 ways as a sum of consecutive naturals, for example, 67395 + ... + 69423.

It is an arithmetic number, because the mean of its divisors is an integer number (9130940).

Almost surely, 2^138801861 is an apocalyptic number.

138801861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138801861 is a deficient number, since it is larger than the sum of its proper divisors (80340699).

138801861 is a wasteful number, since it uses less digits than its factorization.

138801861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737 (or 2734 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 138801861 is about 11781.4201605749. The cubic root of 138801861 is about 517.7638953713.

The spelling of 138801861 in words is "one hundred thirty-eight million, eight hundred one thousand, eight hundred sixty-one".