3147840 has 84 divisors (see below), whose sum is σ = 10837164. Its totient is φ = 838656.

The previous prime is 3147797. The next prime is 3147853. The reversal of 3147840 is 487413.

It can be written as a sum of positive squares in 2 ways, for example, as 2359296 + 788544 = 1536^2 + 888^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2334 + ... + 3426.

Almost surely, 2^3147840 is an apocalyptic number.

3147840 is a gapful number since it is divisible by the number (30) 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 3147840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5418582).

3147840 is an abundant number, since it is smaller than the sum of its proper divisors (7689324).

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

3147840 is a wasteful number, since it uses less digits than its factorization.

3147840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1103 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 3147840 is about 1774.2153195145. The cubic root of 3147840 is about 146.5562070044.

The spelling of 3147840 in words is "three million, one hundred forty-seven thousand, eight hundred forty".