7872815 has 4 divisors (see below), whose sum is σ = 9447384. Its totient is φ = 6298248.

The previous prime is 7872803. The next prime is 7872817. The reversal of 7872815 is 5182787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5182787 = 71 ⋅72997.

It is a cyclic number.

It is not a de Polignac number, because 7872815 - 2⁸ = 7872559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7872817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787277 + ... + 787286.

It is an arithmetic number, because the mean of its divisors is an integer number (2361846).

Almost surely, 2^7872815 is an apocalyptic number.

7872815 is a deficient number, since it is larger than the sum of its proper divisors (1574569).

7872815 is a wasteful number, since it uses less digits than its factorization.

7872815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1574568.

The product of its digits is 31360, while the sum is 38.

The square root of 7872815 is about 2805.8537025298. The cubic root of 7872815 is about 198.9344581848.

The spelling of 7872815 in words is "seven million, eight hundred seventy-two thousand, eight hundred fifteen".