12690040 has 64 divisors (see below), whose sum is σ = 31518720. Its totient is φ = 4560000.

The previous prime is 12690037. The next prime is 12690049. The reversal of 12690040 is 4009621.

It is a super-2 number, since 2×12690040² = 322074230403200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 12689993 and 12690020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12690049) 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, 66345 + ... + 66535.

It is an arithmetic number, because the mean of its divisors is an integer number (492480).

Almost surely, 2^12690040 is an apocalyptic number.

12690040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12690040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15759360).

12690040 is an abundant number, since it is smaller than the sum of its proper divisors (18828680).

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

12690040 is a wasteful number, since it uses less digits than its factorization.

12690040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12690040 is about 3562.3082404531. The cubic root of 12690040 is about 233.2496479943.

Adding to 12690040 its reverse (4009621), we get a palindrome (16699661).

The spelling of 12690040 in words is "twelve million, six hundred ninety thousand, forty".