2947643 has 4 divisors (see below), whose sum is σ = 2951520. Its totient is φ = 2943768.

The previous prime is 2947621. The next prime is 2947649. The reversal of 2947643 is 3467492.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2947643 is a prime.

It is a d-powerful number, because it can be written as 2¹⁹ + 9² + 4² + 7⁷ + 6⁴ + 4⁶ + 3¹³ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2947649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 2457.

It is an arithmetic number, because the mean of its divisors is an integer number (737880).

2^2947643 is an apocalyptic number.

2947643 is a deficient number, since it is larger than the sum of its proper divisors (3877).

2947643 is a wasteful number, since it uses less digits than its factorization.

2947643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876.

The product of its digits is 36288, while the sum is 35.

The square root of 2947643 is about 1716.8701173939. The cubic root of 2947643 is about 143.3810075173.

The spelling of 2947643 in words is "two million, nine hundred forty-seven thousand, six hundred forty-three".