2947840 has 108 divisors (see below), whose sum is σ = 8388576. Its totient is φ = 989184.

The previous prime is 2947823. The next prime is 2947843. The reversal of 2947840 is 487492.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2947796 and 2947805.

It is not an unprimeable number, because it can be changed into a prime (2947843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62697 + ... + 62743.

It is an arithmetic number, because the mean of its divisors is an integer number (77672).

2^2947840 is an apocalyptic number.

2947840 is a gapful number since it is divisible by the number (20) 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 2947840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4194288).

2947840 is an abundant number, since it is smaller than the sum of its proper divisors (5440736).

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

2947840 is an equidigital number, since it uses as much as digits as its factorization.

2947840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 61 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 2947840 is about 1716.9274882767. The cubic root of 2947840 is about 143.3842016433.

The spelling of 2947840 in words is "two million, nine hundred forty-seven thousand, eight hundred forty".