4392409 has 12 divisors (see below), whose sum is σ = 5411124. Its totient is φ = 3542784.

The previous prime is 4392403. The next prime is 4392433. The reversal of 4392409 is 9042934.

It can be written as a sum of positive squares in 2 ways, for example, as 2822400 + 1570009 = 1680^2 + 1253^2 .

It is not a de Polignac number, because 4392409 - 2⁷ = 4392281 is a prime.

It is a Duffinian number.

4392409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4392403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1804 + ... + 3469.

It is an arithmetic number, because the mean of its divisors is an integer number (450927).

Almost surely, 2^4392409 is an apocalyptic number.

4392409 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

4392409 is a deficient number, since it is larger than the sum of its proper divisors (1018715).

4392409 is a wasteful number, since it uses less digits than its factorization.

4392409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304 (or 5297 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 4392409 is about 2095.8074816166. The cubic root of 4392409 is about 163.7699655162.

The spelling of 4392409 in words is "four million, three hundred ninety-two thousand, four hundred nine".