12738540 has 48 divisors (see below), whose sum is σ = 36902880. Its totient is φ = 3279360.

The previous prime is 12738533. The next prime is 12738563. The reversal of 12738540 is 4583721.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12738498 and 12738507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921 + ... + 5400.

It is an arithmetic number, because the mean of its divisors is an integer number (768810).

Almost surely, 2^12738540 is an apocalyptic number.

12738540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12738540 is an abundant number, since it is smaller than the sum of its proper divisors (24164340).

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

12738540 is a wasteful number, since it uses less digits than its factorization.

12738540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362 (or 7360 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 12738540 is about 3569.1091325427. The cubic root of 12738540 is about 233.5464221201.

The spelling of 12738540 in words is "twelve million, seven hundred thirty-eight thousand, five hundred forty".