3978490 has 8 divisors (see below), whose sum is σ = 7161300. Its totient is φ = 1591392.

The previous prime is 3978479. The next prime is 3978497. The reversal of 3978490 is 948793.

It can be written as a sum of positive squares in 2 ways, for example, as 3674889 + 303601 = 1917^2 + 551^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (3978497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198915 + ... + 198934.

Almost surely, 2^3978490 is an apocalyptic number.

3978490 is a deficient number, since it is larger than the sum of its proper divisors (3182810).

3978490 is a wasteful number, since it uses less digits than its factorization.

3978490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397856.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 3978490 is about 1994.6152511199. The cubic root of 3978490 is about 158.4550519881.

The spelling of 3978490 in words is "three million, nine hundred seventy-eight thousand, four hundred ninety".