2724639 has 4 divisors (see below), whose sum is σ = 3632856. Its totient is φ = 1816424.

The previous prime is 2724629. The next prime is 2724653. The reversal of 2724639 is 9364272.

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

It is a cyclic number.

It is not a de Polignac number, because 2724639 - 2⁸ = 2724383 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2724629) 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, 454104 + ... + 454109.

It is an arithmetic number, because the mean of its divisors is an integer number (908214).

2^2724639 is an apocalyptic number.

2724639 is a deficient number, since it is larger than the sum of its proper divisors (908217).

2724639 is an equidigital number, since it uses as much as digits as its factorization.

2724639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908216.

The product of its digits is 18144, while the sum is 33.

The square root of 2724639 is about 1650.6480545531. The cubic root of 2724639 is about 139.6699538291.

The spelling of 2724639 in words is "two million, seven hundred twenty-four thousand, six hundred thirty-nine".