2378409 has 8 divisors (see below), whose sum is σ = 3459552. Its totient is φ = 1441440.

The previous prime is 2378399. The next prime is 2378423. The reversal of 2378409 is 9048732.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2378409 - 2¹³ = 2370217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 72073 = 2378409 / (2 + 3 + 7 + 8 + 4 + 0 + 9).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2378409.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2378479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36004 + ... + 36069.

It is an arithmetic number, because the mean of its divisors is an integer number (432444).

2^2378409 is an apocalyptic number.

It is an amenable number.

2378409 is a deficient number, since it is larger than the sum of its proper divisors (1081143).

2378409 is a wasteful number, since it uses less digits than its factorization.

2378409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72087.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 2378409 is about 1542.2091297875. The cubic root of 2378409 is about 133.4838875756.

It can be divided in two parts, 237 and 8409, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 2378409 in words is "two million, three hundred seventy-eight thousand, four hundred nine".