2740421 has 2 divisors, whose sum is σ = 2740422. Its totient is φ = 2740420.

The previous prime is 2740403. The next prime is 2740453. The reversal of 2740421 is 1240472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656900 + 83521 = 1630^2 + 289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2740421 - 2⁶ = 2740357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2740393 and 2740402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2740721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1370210 + 1370211.

It is an arithmetic number, because the mean of its divisors is an integer number (1370211).

2^2740421 is an apocalyptic number.

It is an amenable number.

2740421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2740421 is an equidigital number, since it uses as much as digits as its factorization.

2740421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2740421 is about 1655.4216985409. The cubic root of 2740421 is about 139.9391061708.

Adding to 2740421 its reverse (1240472), we get a palindrome (3980893).

The spelling of 2740421 in words is "two million, seven hundred forty thousand, four hundred twenty-one".