138824897 has 4 divisors (see below), whose sum is σ = 138988500. Its totient is φ = 138661296.

The previous prime is 138824869. The next prime is 138824909. The reversal of 138824897 is 798428831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 798428831 = 23 ⋅34714297.

It can be written as a sum of positive squares in 2 ways, for example, as 57896881 + 80928016 = 7609^2 + 8996^2 .

It is a cyclic number.

It is not a de Polignac number, because 138824897 - 2¹⁴ = 138808513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138824867) 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, 80522 + ... + 82227.

It is an arithmetic number, because the mean of its divisors is an integer number (34747125).

Almost surely, 2^138824897 is an apocalyptic number.

It is an amenable number.

138824897 is a deficient number, since it is larger than the sum of its proper divisors (163603).

138824897 is an equidigital number, since it uses as much as digits as its factorization.

138824897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163602.

The product of its digits is 774144, while the sum is 50.

The square root of 138824897 is about 11782.3977610671. The cubic root of 138824897 is about 517.7925370366.

The spelling of 138824897 in words is "one hundred thirty-eight million, eight hundred twenty-four thousand, eight hundred ninety-seven".