12538840 has 16 divisors (see below), whose sum is σ = 28212480. Its totient is φ = 5015520.

The previous prime is 12538831. The next prime is 12538873. The reversal of 12538840 is 4883521.

It is a super-3 number, since 3×12538840³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156696 + ... + 156775.

It is an arithmetic number, because the mean of its divisors is an integer number (1763280).

Almost surely, 2^12538840 is an apocalyptic number.

12538840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12538840 is an abundant number, since it is smaller than the sum of its proper divisors (15673640).

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

12538840 is a wasteful number, since it uses less digits than its factorization.

12538840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313482 (or 313478 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 12538840 is about 3541.0224512138. The cubic root of 12538840 is about 232.3195655615.

The spelling of 12538840 in words is "twelve million, five hundred thirty-eight thousand, eight hundred forty".