2947391 has 4 divisors (see below), whose sum is σ = 2960832. Its totient is φ = 2933952.

The previous prime is 2947363. The next prime is 2947403. The reversal of 2947391 is 1937492.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2947391 - 2¹⁰ = 2946367 is a prime.

It is a super-2 number, since 2×2947391² = 17374227413762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2947331) 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, 6386 + ... + 6831.

It is an arithmetic number, because the mean of its divisors is an integer number (740208).

2^2947391 is an apocalyptic number.

2947391 is a deficient number, since it is larger than the sum of its proper divisors (13441).

2947391 is a wasteful number, since it uses less digits than its factorization.

2947391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13440.

The product of its digits is 13608, while the sum is 35.

The square root of 2947391 is about 1716.7967264647. The cubic root of 2947391 is about 143.3769214228.

The spelling of 2947391 in words is "two million, nine hundred forty-seven thousand, three hundred ninety-one".