7893981 has 6 divisors (see below), whose sum is σ = 11402430. Its totient is φ = 5262648.

The previous prime is 7893943. The next prime is 7893989. The reversal of 7893981 is 1893987.

It can be written as a sum of positive squares in only one way, i.e., 5616900 + 2277081 = 2370^2 + 1509^2 .

It is not a de Polignac number, because 7893981 - 2¹⁰ = 7892957 is a prime.

It is a super-2 number, since 2×7893981² = 124629872056722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7893989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 438546 + ... + 438563.

It is an arithmetic number, because the mean of its divisors is an integer number (1900405).

Almost surely, 2^7893981 is an apocalyptic number.

It is an amenable number.

7893981 is a deficient number, since it is larger than the sum of its proper divisors (3508449).

7893981 is a wasteful number, since it uses less digits than its factorization.

7893981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877115 (or 877112 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 7893981 is about 2809.6229284372. The cubic root of 7893981 is about 199.1125765553.

The spelling of 7893981 in words is "seven million, eight hundred ninety-three thousand, nine hundred eighty-one".