7994981 has 8 divisors (see below), whose sum is σ = 8757720. Its totient is φ = 7264768.

The previous prime is 7994977. The next prime is 7994999. The reversal of 7994981 is 1894997.

It can be written as a sum of positive squares in 4 ways, for example, as 3441025 + 4553956 = 1855^2 + 2134^2 .

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 7994981 - 2² = 7994977 is a prime.

It is a super-2 number, since 2×7994981² = 127839442380722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7994941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7616 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (1094715).

Almost surely, 2^7994981 is an apocalyptic number.

It is an amenable number.

7994981 is a deficient number, since it is larger than the sum of its proper divisors (762739).

7994981 is a wasteful number, since it uses less digits than its factorization.

7994981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16263.

The product of its digits is 163296, while the sum is 47.

The square root of 7994981 is about 2827.5397433104. The cubic root of 7994981 is about 199.9581662503.

The spelling of 7994981 in words is "seven million, nine hundred ninety-four thousand, nine hundred eighty-one".