138326897 has 24 divisors (see below), whose sum is σ = 153939240. Its totient is φ = 124104960.

The previous prime is 138326893. The next prime is 138326911. The reversal of 138326897 is 798623831.

It can be written as a sum of positive squares in 4 ways, for example, as 1343281 + 136983616 = 1159^2 + 11704^2 .

It is not a de Polignac number, because 138326897 - 2² = 138326893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138326893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 764147 + ... + 764327.

It is an arithmetic number, because the mean of its divisors is an integer number (6414135).

Almost surely, 2^138326897 is an apocalyptic number.

It is an amenable number.

138326897 is a deficient number, since it is larger than the sum of its proper divisors (15612343).

138326897 is a wasteful number, since it uses less digits than its factorization.

138326897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 302 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 138326897 is about 11761.2455547871. The cubic root of 138326897 is about 517.1726442984.

The spelling of 138326897 in words is "one hundred thirty-eight million, three hundred twenty-six thousand, eight hundred ninety-seven".