7971905 has 8 divisors (see below), whose sum is σ = 9770112. Its totient is φ = 6241648.

The previous prime is 7971881. The next prime is 7971911. The reversal of 7971905 is 5091797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7971905 - 2¹⁰ = 7970881 is a prime.

It is a Duffinian 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, 16727 + ... + 17196.

It is an arithmetic number, because the mean of its divisors is an integer number (1221264).

Almost surely, 2^7971905 is an apocalyptic number.

It is an amenable number.

7971905 is a deficient number, since it is larger than the sum of its proper divisors (1798207).

7971905 is a wasteful number, since it uses less digits than its factorization.

7971905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33975.

The product of its (nonzero) digits is 19845, while the sum is 38.

The square root of 7971905 is about 2823.4562153503. The cubic root of 7971905 is about 199.7656003914.

The spelling of 7971905 in words is "seven million, nine hundred seventy-one thousand, nine hundred five".