7991408 has 20 divisors (see below), whose sum is σ = 15903000. Its totient is φ = 3887424.

The previous prime is 7991407. The next prime is 7991437. The reversal of 7991408 is 8041997.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991407) 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, 6158 + ... + 7341.

It is an arithmetic number, because the mean of its divisors is an integer number (795150).

Almost surely, 2^7991408 is an apocalyptic number.

It is an amenable number.

7991408 is a deficient number, since it is larger than the sum of its proper divisors (7911592).

7991408 is a wasteful number, since it uses less digits than its factorization.

7991408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13544 (or 13538 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 7991408 is about 2826.9078513457. The cubic root of 7991408 is about 199.9283743519.

The spelling of 7991408 in words is "seven million, nine hundred ninety-one thousand, four hundred eight".