2723409 has 16 divisors (see below), whose sum is σ = 4345600. Its totient is φ = 1675728.

The previous prime is 2723401. The next prime is 2723431. The reversal of 2723409 is 9043272.

It is not a de Polignac number, because 2723409 - 2³ = 2723401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

2723409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2723401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3529 + ... + 4230.

It is an arithmetic number, because the mean of its divisors is an integer number (271600).

2^2723409 is an apocalyptic number.

It is an amenable number.

2723409 is a deficient number, since it is larger than the sum of its proper divisors (1622191).

2723409 is a wasteful number, since it uses less digits than its factorization.

2723409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7781 (or 7775 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 2723409 is about 1650.2754315568. The cubic root of 2723409 is about 139.6489333195.

It can be divided in two parts, 27 and 23409, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 2723409 in words is "two million, seven hundred twenty-three thousand, four hundred nine".