7971895 has 8 divisors (see below), whose sum is σ = 10129104. Its totient is φ = 6002304.

The previous prime is 7971881. The next prime is 7971911. The reversal of 7971895 is 5981797.

7971895 = 722² + 723² + ... + 736².

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 7971895 - 2¹⁷ = 7840823 is a prime.

It is a super-2 number, since 2×7971895² = 127102219782050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

7971895 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46809 + ... + 46978.

It is an arithmetic number, because the mean of its divisors is an integer number (1266138).

Almost surely, 2^7971895 is an apocalyptic number.

7971895 is a deficient number, since it is larger than the sum of its proper divisors (2157209).

7971895 is a wasteful number, since it uses less digits than its factorization.

7971895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93809.

The product of its digits is 158760, while the sum is 46.

The square root of 7971895 is about 2823.4544444705. The cubic root of 7971895 is about 199.7655168624.

The spelling of 7971895 in words is "seven million, nine hundred seventy-one thousand, eight hundred ninety-five".