138883649 has 2 divisors, whose sum is σ = 138883650. Its totient is φ = 138883648.

The previous prime is 138883643. The next prime is 138883757. The reversal of 138883649 is 946388831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74995600 + 63888049 = 8660^2 + 7993^2 .

It is a cyclic number.

It is not a de Polignac number, because 138883649 - 2¹² = 138879553 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138883597 and 138883606.

It is not a weakly prime, because it can be changed into another prime (138883643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69441824 + 69441825.

It is an arithmetic number, because the mean of its divisors is an integer number (69441825).

Almost surely, 2^138883649 is an apocalyptic number.

It is an amenable number.

138883649 is a deficient number, since it is larger than the sum of its proper divisors (1).

138883649 is an equidigital number, since it uses as much as digits as its factorization.

138883649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 50.

The square root of 138883649 is about 11784.8907080210. The cubic root of 138883649 is about 517.8655716225.

The spelling of 138883649 in words is "one hundred thirty-eight million, eight hundred eighty-three thousand, six hundred forty-nine".