12640940 has 24 divisors (see below), whose sum is σ = 28588560. Its totient is φ = 4667328.

The previous prime is 12640931. The next prime is 12640951. The reversal of 12640940 is 4904621.

It is a super-3 number, since 3×12640940³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24050 + ... + 24569.

It is an arithmetic number, because the mean of its divisors is an integer number (1191190).

Almost surely, 2^12640940 is an apocalyptic number.

12640940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640940 is an abundant number, since it is smaller than the sum of its proper divisors (15947620).

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

12640940 is a wasteful number, since it uses less digits than its factorization.

12640940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48641 (or 48639 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 12640940 is about 3555.4099622969. The cubic root of 12640940 is about 232.9484311816.

The spelling of 12640940 in words is "twelve million, six hundred forty thousand, nine hundred forty".