7891816 has 8 divisors (see below), whose sum is σ = 14797170. Its totient is φ = 3945904.

The previous prime is 7891813. The next prime is 7891847. The reversal of 7891816 is 6181987.

It can be written as a sum of positive squares in only one way, i.e., 6522916 + 1368900 = 2554^2 + 1170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (7891813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493231 + ... + 493246.

Almost surely, 2^7891816 is an apocalyptic number.

It is an amenable number.

7891816 is a deficient number, since it is larger than the sum of its proper divisors (6905354).

7891816 is a wasteful number, since it uses less digits than its factorization.

7891816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986483 (or 986479 counting only the distinct ones).

The product of its digits is 24192, while the sum is 40.

The square root of 7891816 is about 2809.2376189991. The cubic root of 7891816 is about 199.0943720464.

The spelling of 7891816 in words is "seven million, eight hundred ninety-one thousand, eight hundred sixteen".