138853457 has 2 divisors, whose sum is σ = 138853458. Its totient is φ = 138853456.

The previous prime is 138853453. The next prime is 138853459. The reversal of 138853457 is 754358831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 95082001 + 43771456 = 9751^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 138853457 - 2² = 138853453 is a prime.

Together with 138853459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138853453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69426728 + 69426729.

It is an arithmetic number, because the mean of its divisors is an integer number (69426729).

Almost surely, 2^138853457 is an apocalyptic number.

It is an amenable number.

138853457 is a deficient number, since it is larger than the sum of its proper divisors (1).

138853457 is an equidigital number, since it uses as much as digits as its factorization.

138853457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 44.

The square root of 138853457 is about 11783.6096761561. The cubic root of 138853457 is about 517.8280425335.

It can be divided in two parts, 1388 and 53457, that added together give a palindrome (54845).

The spelling of 138853457 in words is "one hundred thirty-eight million, eight hundred fifty-three thousand, four hundred fifty-seven".