7961978 has 16 divisors (see below), whose sum is σ = 12566016. Its totient is φ = 3778320.

The previous prime is 7961959. The next prime is 7961981. The reversal of 7961978 is 8791697.

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, 2075 + ... + 4497.

It is an arithmetic number, because the mean of its divisors is an integer number (785376).

Almost surely, 2^7961978 is an apocalyptic number.

7961978 is a deficient number, since it is larger than the sum of its proper divisors (4604038).

7961978 is a wasteful number, since it uses less digits than its factorization.

7961978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509.

The product of its digits is 190512, while the sum is 47.

The square root of 7961978 is about 2821.6977159150. The cubic root of 7961978 is about 199.6826467008.

It can be divided in two parts, 79619 and 78, that added together give a palindrome (79697).

The spelling of 7961978 in words is "seven million, nine hundred sixty-one thousand, nine hundred seventy-eight".