2742421 has 4 divisors (see below), whose sum is σ = 2991744. Its totient is φ = 2493100.

The previous prime is 2742409. The next prime is 2742427. The reversal of 2742421 is 1242472.

It is a happy number.

2742421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2742421 - 2⁷ = 2742293 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2742392 and 2742401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2742427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124645 + ... + 124666.

It is an arithmetic number, because the mean of its divisors is an integer number (747936).

2^2742421 is an apocalyptic number.

It is an amenable number.

2742421 is a deficient number, since it is larger than the sum of its proper divisors (249323).

2742421 is a wasteful number, since it uses less digits than its factorization.

2742421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249322.

The product of its digits is 896, while the sum is 22.

The square root of 2742421 is about 1656.0256640523. The cubic root of 2742421 is about 139.9731411060.

Adding to 2742421 its reverse (1242472), we get a palindrome (3984893).

The spelling of 2742421 in words is "two million, seven hundred forty-two thousand, four hundred twenty-one".