12147640 has 16 divisors (see below), whose sum is σ = 27332280. Its totient is φ = 4859040.

The previous prime is 12147599. The next prime is 12147659. The reversal of 12147640 is 4674121.

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, 151806 + ... + 151885.

Almost surely, 2^12147640 is an apocalyptic number.

12147640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12147640 is an abundant number, since it is smaller than the sum of its proper divisors (15184640).

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

12147640 is a wasteful number, since it uses less digits than its factorization.

12147640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303702 (or 303698 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 12147640 is about 3485.3464677131. The cubic root of 12147640 is about 229.8779440607.

The spelling of 12147640 in words is "twelve million, one hundred forty-seven thousand, six hundred forty".