7881406 has 16 divisors (see below), whose sum is σ = 12855024. Its totient is φ = 3602304.

The previous prime is 7881373. The next prime is 7881487. The reversal of 7881406 is 6041887.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366 + ... + 4198.

It is an arithmetic number, because the mean of its divisors is an integer number (803439).

Almost surely, 2^7881406 is an apocalyptic number.

7881406 is a deficient number, since it is larger than the sum of its proper divisors (4973618).

7881406 is a wasteful number, since it uses less digits than its factorization.

7881406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 7881406 is about 2807.3841917344. The cubic root of 7881406 is about 199.0067925259.

The spelling of 7881406 in words is "seven million, eight hundred eighty-one thousand, four hundred six".