138796861 has 6 divisors (see below), whose sum is σ = 161457630. Its totient is φ = 118968696.

The previous prime is 138796829. The next prime is 138796909. The reversal of 138796861 is 168697831.

It can be written as a sum of positive squares in only one way, i.e., 138791961 + 4900 = 11781^2 + 70^2 .

It is not a de Polignac number, because 138796861 - 2⁵ = 138796829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 2832589 = 138796861 / (1 + 3 + 8 + 7 + 9 + 6 + 8 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138796811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1416246 + ... + 1416343.

It is an arithmetic number, because the mean of its divisors is an integer number (26909605).

Almost surely, 2^138796861 is an apocalyptic number.

It is an amenable number.

138796861 is a deficient number, since it is larger than the sum of its proper divisors (22660769).

138796861 is an equidigital number, since it uses as much as digits as its factorization.

138796861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832603 (or 2832596 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 138796861 is about 11781.2079601372. The cubic root of 138796861 is about 517.7576782343.

The spelling of 138796861 in words is "one hundred thirty-eight million, seven hundred ninety-six thousand, eight hundred sixty-one".