138240825 has 24 divisors (see below), whose sum is σ = 236443200. Its totient is φ = 71184960.

The previous prime is 138240797. The next prime is 138240841. The reversal of 138240825 is 528042831.

138240825 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138240825 - 2⁶ = 138240761 is a prime.

It is a super-2 number, since 2×138240825² = 38221051393361250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29605 + ... + 33954.

It is an arithmetic number, because the mean of its divisors is an integer number (9851800).

Almost surely, 2^138240825 is an apocalyptic number.

138240825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138240825 is a deficient number, since it is larger than the sum of its proper divisors (98202375).

138240825 is a wasteful number, since it uses less digits than its factorization.

138240825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63601 (or 63596 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 138240825 is about 11757.5858491444. The cubic root of 138240825 is about 517.0653541986.

The spelling of 138240825 in words is "one hundred thirty-eight million, two hundred forty thousand, eight hundred twenty-five".