7919865 has 48 divisors (see below), whose sum is σ = 14788800. Its totient is φ = 3908736.

The previous prime is 7919861. The next prime is 7919893. The reversal of 7919865 is 5689197.

It is not a de Polignac number, because 7919865 - 2² = 7919861 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

Its product of digits (136080) is a multiple of the sum of its prime divisors (243).

7919865 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7919865.

It is not an unprimeable number, because it can be changed into a prime (7919861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50367 + ... + 50523.

It is an arithmetic number, because the mean of its divisors is an integer number (308100).

Almost surely, 2^7919865 is an apocalyptic number.

It is an amenable number.

7919865 is a deficient number, since it is larger than the sum of its proper divisors (6868935).

7919865 is a wasteful number, since it uses less digits than its factorization.

7919865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 243 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 7919865 is about 2814.2254707113. The cubic root of 7919865 is about 199.3299661130.

The spelling of 7919865 in words is "seven million, nine hundred nineteen thousand, eight hundred sixty-five".