2718421 has 4 divisors (see below), whose sum is σ = 2806144. Its totient is φ = 2630700.

The previous prime is 2718413. The next prime is 2718437. The reversal of 2718421 is 1248172.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2718421 - 2³ = 2718413 is a prime.

It is a Duffinian number.

2718421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2718461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43815 + ... + 43876.

It is an arithmetic number, because the mean of its divisors is an integer number (701536).

2^2718421 is an apocalyptic number.

It is an amenable number.

2718421 is a deficient number, since it is larger than the sum of its proper divisors (87723).

2718421 is an equidigital number, since it uses as much as digits as its factorization.

2718421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87722.

The product of its digits is 896, while the sum is 25.

The square root of 2718421 is about 1648.7634760632. The cubic root of 2718421 is about 139.5636242363.

The spelling of 2718421 in words is "two million, seven hundred eighteen thousand, four hundred twenty-one".