2947421 has 4 divisors (see below), whose sum is σ = 2954844. Its totient is φ = 2940000.

The previous prime is 2947403. The next prime is 2947429. The reversal of 2947421 is 1247492.

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

It can be written as a sum of positive squares in 2 ways, for example, as 422500 + 2524921 = 650^2 + 1589^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2947421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2947429) 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, 3080 + ... + 3921.

It is an arithmetic number, because the mean of its divisors is an integer number (738711).

2^2947421 is an apocalyptic number.

It is an amenable number.

2947421 is a deficient number, since it is larger than the sum of its proper divisors (7423).

2947421 is an equidigital number, since it uses as much as digits as its factorization.

2947421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7422.

The product of its digits is 4032, while the sum is 29.

The square root of 2947421 is about 1716.8054636446. The cubic root of 2947421 is about 143.3774078748.

The spelling of 2947421 in words is "two million, nine hundred forty-seven thousand, four hundred twenty-one".