138848418 has 40 divisors (see below), whose sum is σ = 329431212. Its totient is φ = 43559424.

The previous prime is 138848407. The next prime is 138848441. The reversal of 138848418 is 814848831.

It can be written as a sum of positive squares in 2 ways, for example, as 138368169 + 480249 = 11763^2 + 693^2 .

It is a super-2 number, since 2×138848418² = 38557766362205448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22455 + ... + 27962.

Almost surely, 2^138848418 is an apocalyptic number.

138848418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138848418 is an abundant number, since it is smaller than the sum of its proper divisors (190582794).

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

138848418 is a wasteful number, since it uses less digits than its factorization.

138848418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50448 (or 50439 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 138848418 is about 11783.3958602773. The cubic root of 138848418 is about 517.8217784545.

The spelling of 138848418 in words is "one hundred thirty-eight million, eight hundred forty-eight thousand, four hundred eighteen".