2720423 has 4 divisors (see below), whose sum is σ = 2733528. Its totient is φ = 2707320.

The previous prime is 2720411. The next prime is 2720441. The reversal of 2720423 is 3240272.

It is a happy number.

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 2720423 - 2⁶ = 2720359 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2720395 and 2720404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2720623) 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, 6236 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (683382).

2^2720423 is an apocalyptic number.

2720423 is a deficient number, since it is larger than the sum of its proper divisors (13105).

2720423 is a wasteful number, since it uses less digits than its factorization.

2720423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13104.

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 2720423 is about 1649.3704859734. The cubic root of 2720423 is about 139.5978766956.

Adding to 2720423 its reverse (3240272), we get a palindrome (5960695).

The spelling of 2720423 in words is "two million, seven hundred twenty thousand, four hundred twenty-three".