11947640 has 16 divisors (see below), whose sum is σ = 26882280. Its totient is φ = 4779040.

The previous prime is 11947613. The next prime is 11947657. The reversal of 11947640 is 4674911.

It is a super-2 number, since 2×11947640² = 285492203139200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11947597 and 11947606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149306 + ... + 149385.

Almost surely, 2^11947640 is an apocalyptic number.

11947640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11947640 is an abundant number, since it is smaller than the sum of its proper divisors (14934640).

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

11947640 is a wasteful number, since it uses less digits than its factorization.

11947640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298702 (or 298698 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 11947640 is about 3456.5358380899. The cubic root of 11947640 is about 228.6093783715.

The spelling of 11947640 in words is "eleven million, nine hundred forty-seven thousand, six hundred forty".