8378999 has 4 divisors (see below), whose sum is σ = 8667960. Its totient is φ = 8090040.

The previous prime is 8378989. The next prime is 8379017. The reversal of 8378999 is 9998738.

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 8378999 - 2¹⁶ = 8313463 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8378999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378989) 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, 144437 + ... + 144494.

It is an arithmetic number, because the mean of its divisors is an integer number (2166990).

Almost surely, 2^8378999 is an apocalyptic number.

8378999 is a deficient number, since it is larger than the sum of its proper divisors (288961).

8378999 is a wasteful number, since it uses less digits than its factorization.

8378999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288960.

The product of its digits is 979776, while the sum is 53.

The square root of 8378999 is about 2894.6500652065. The cubic root of 8378999 is about 203.1097225275.

The spelling of 8378999 in words is "eight million, three hundred seventy-eight thousand, nine hundred ninety-nine".