138261007 has 4 divisors (see below), whose sum is σ = 138287776. Its totient is φ = 138234240.

The previous prime is 138260989. The next prime is 138261041. The reversal of 138261007 is 700162831.

138261007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138261007 - 2¹¹ = 138258959 is a prime.

It is a super-2 number, since 2×138261007² = 38232212113308098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138231007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2898 + ... + 16879.

It is an arithmetic number, because the mean of its divisors is an integer number (34571944).

Almost surely, 2^138261007 is an apocalyptic number.

138261007 is a deficient number, since it is larger than the sum of its proper divisors (26769).

138261007 is an equidigital number, since it uses as much as digits as its factorization.

138261007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26768.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 138261007 is about 11758.4440722402. Note that the first 3 decimals coincide. The cubic root of 138261007 is about 517.0905153746.

The spelling of 138261007 in words is "one hundred thirty-eight million, two hundred sixty-one thousand, seven".