7904378 has 4 divisors (see below), whose sum is σ = 11856570. Its totient is φ = 3952188.

The previous prime is 7904363. The next prime is 7904381. The reversal of 7904378 is 8734097.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8734097 = 331 ⋅26387.

It can be written as a sum of positive squares in only one way, i.e., 5004169 + 2900209 = 2237^2 + 1703^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1976093 + ... + 1976096.

Almost surely, 2^7904378 is an apocalyptic number.

7904378 is a deficient number, since it is larger than the sum of its proper divisors (3952192).

7904378 is a wasteful number, since it uses less digits than its factorization.

7904378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952191.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 7904378 is about 2811.4725678904. The cubic root of 7904378 is about 199.1999538986.

The spelling of 7904378 in words is "seven million, nine hundred four thousand, three hundred seventy-eight".