138806052 has 48 divisors (see below), whose sum is σ = 403802112. Its totient is φ = 36053280.

The previous prime is 138806051. The next prime is 138806117. The reversal of 138806052 is 250608831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (138806051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74188 + ... + 76035.

It is an arithmetic number, because the mean of its divisors is an integer number (8412544).

Almost surely, 2^138806052 is an apocalyptic number.

138806052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138806052 is an abundant number, since it is smaller than the sum of its proper divisors (264996060).

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

138806052 is a wasteful number, since it uses less digits than its factorization.

138806052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150248 (or 150246 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 138806052 is about 11781.5980240373. The cubic root of 138806052 is about 517.7691064605.

The spelling of 138806052 in words is "one hundred thirty-eight million, eight hundred six thousand, fifty-two".