138505454 has 4 divisors (see below), whose sum is σ = 207758184. Its totient is φ = 69252726.

The previous prime is 138505453. The next prime is 138505457. The reversal of 138505454 is 454505831.

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

It is a super-2 number, since 2×138505454² = 38367521575492232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138505453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34626362 + ... + 34626365.

It is an arithmetic number, because the mean of its divisors is an integer number (51939546).

Almost surely, 2^138505454 is an apocalyptic number.

138505454 is a deficient number, since it is larger than the sum of its proper divisors (69252730).

138505454 is an equidigital number, since it uses as much as digits as its factorization.

138505454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69252729.

The product of its (nonzero) digits is 48000, while the sum is 35.

The square root of 138505454 is about 11768.8340119147. The cubic root of 138505454 is about 517.3950765523.

The spelling of 138505454 in words is "one hundred thirty-eight million, five hundred five thousand, four hundred fifty-four".