3978320 has 30 divisors (see below), whose sum is σ = 9291258.
Its totient is φ = 1584192.
The previous prime is 3978301. The next prime is 3978329. The reversal of 3978320 is 238793.
It can be written as a sum of positive squares in only one way, i.e., 3182656 + 795664 = 1784^2 + 892^2
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3978329) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17729 + ... + 17951.
Almost surely, 23978320 is an apocalyptic number.
It is an amenable number.
3978320 is an abundant number, since it is smaller than the sum of its proper divisors (5312938).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3978320 is an equidigital number, since it uses as much as digits as its factorization.
3978320 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 459 (or 230 counting only the distinct ones).
The product of its (nonzero) digits is 9072, while the sum is 32.
The square root of 3978320 is about 1994.5726359298.
The cubic root of 3978320 is about 158.4527950395.
The spelling of 3978320 in words is "three million, nine hundred seventy-eight thousand, three hundred twenty".