7934978 has 4 divisors (see below), whose sum is σ = 11902470. Its totient is φ = 3967488.

The previous prime is 7934959. The next prime is 7934981. The reversal of 7934978 is 8794397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8794397 = 19 ⋅462863.

It can be written as a sum of positive squares in only one way, i.e., 4826809 + 3108169 = 2197^2 + 1763^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1983743 + ... + 1983746.

Almost surely, 2^7934978 is an apocalyptic number.

7934978 is a deficient number, since it is larger than the sum of its proper divisors (3967492).

7934978 is a wasteful number, since it uses less digits than its factorization.

7934978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967491.

The product of its digits is 381024, while the sum is 47.

The square root of 7934978 is about 2816.9092992143. The cubic root of 7934978 is about 199.4566753281.

The spelling of 7934978 in words is "seven million, nine hundred thirty-four thousand, nine hundred seventy-eight".