8378409 has 8 divisors (see below), whose sum is σ = 12030592. Its totient is φ = 5155920.

The previous prime is 8378407. The next prime is 8378431. The reversal of 8378409 is 9048738.

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

It is not a de Polignac number, because 8378409 - 2¹ = 8378407 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 214831 = 8378409 / (8 + 3 + 7 + 8 + 4 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8378407) 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, 107377 + ... + 107454.

It is an arithmetic number, because the mean of its divisors is an integer number (1503824).

Almost surely, 2^8378409 is an apocalyptic number.

It is an amenable number.

8378409 is a deficient number, since it is larger than the sum of its proper divisors (3652183).

8378409 is a wasteful number, since it uses less digits than its factorization.

8378409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214847.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 8378409 is about 2894.5481512664. The cubic root of 8378409 is about 203.1049551502.

The spelling of 8378409 in words is "eight million, three hundred seventy-eight thousand, four hundred nine".