7972786 has 4 divisors (see below), whose sum is σ = 11959182. Its totient is φ = 3986392.

The previous prime is 7972781. The next prime is 7972817. The reversal of 7972786 is 6872797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6872797 = 29 ⋅236993.

It can be written as a sum of positive squares in only one way, i.e., 6922161 + 1050625 = 2631^2 + 1025^2 .

It is not an unprimeable number, because it can be changed into a prime (7972781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993195 + ... + 1993198.

Almost surely, 2^7972786 is an apocalyptic number.

7972786 is a deficient number, since it is larger than the sum of its proper divisors (3986396).

7972786 is a wasteful number, since it uses less digits than its factorization.

7972786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3986395.

The product of its digits is 296352, while the sum is 46.

The square root of 7972786 is about 2823.6122255012. The cubic root of 7972786 is about 199.7729590262.

The spelling of 7972786 in words is "seven million, nine hundred seventy-two thousand, seven hundred eighty-six".