7954978 has 4 divisors (see below), whose sum is σ = 11932470. Its totient is φ = 3977488.

The previous prime is 7954937. The next prime is 7954979. The reversal of 7954978 is 8794597.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7823209 + 131769 = 2797^2 + 363^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (7954979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1988743 + ... + 1988746.

Almost surely, 2^7954978 is an apocalyptic number.

7954978 is a deficient number, since it is larger than the sum of its proper divisors (3977492).

7954978 is a wasteful number, since it uses less digits than its factorization.

7954978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977491.

The product of its digits is 635040, while the sum is 49.

The square root of 7954978 is about 2820.4570551597. The cubic root of 7954978 is about 199.6241106452.

The spelling of 7954978 in words is "seven million, nine hundred fifty-four thousand, nine hundred seventy-eight".