138455418 has 16 divisors (see below), whose sum is σ = 281604960. Its totient is φ = 45369456.

The previous prime is 138455389. The next prime is 138455437. The reversal of 138455418 is 814554831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195205 + ... + 195912.

It is an arithmetic number, because the mean of its divisors is an integer number (17600310).

Almost surely, 2^138455418 is an apocalyptic number.

138455418 is an abundant number, since it is smaller than the sum of its proper divisors (143149542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138455418 is a wasteful number, since it uses less digits than its factorization.

138455418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391181.

The product of its digits is 76800, while the sum is 39.

The square root of 138455418 is about 11766.7080358102. The cubic root of 138455418 is about 517.3327649311.

The spelling of 138455418 in words is "one hundred thirty-eight million, four hundred fifty-five thousand, four hundred eighteen".