2427721 has 2 divisors, whose sum is σ = 2427722. Its totient is φ = 2427720.

The previous prime is 2427713. The next prime is 2427727. The reversal of 2427721 is 1277242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2295225 + 132496 = 1515^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2427721 - 2³ = 2427713 is a prime.

2427721 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2427727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1213860 + 1213861.

It is an arithmetic number, because the mean of its divisors is an integer number (1213861).

2^2427721 is an apocalyptic number.

It is an amenable number.

2427721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2427721 is an equidigital number, since it uses as much as digits as its factorization.

2427721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1568, while the sum is 25.

The square root of 2427721 is about 1558.1145657493. The cubic root of 2427721 is about 134.4000999444.

The spelling of 2427721 in words is "two million, four hundred twenty-seven thousand, seven hundred twenty-one".