3978955 has 4 divisors (see below), whose sum is σ = 4774752. Its totient is φ = 3183160.

The previous prime is 3978917. The next prime is 3978967. The reversal of 3978955 is 5598793.

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

It is not a de Polignac number, because 3978955 - 2¹³ = 3970763 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 397891 + ... + 397900.

It is an arithmetic number, because the mean of its divisors is an integer number (1193688).

Almost surely, 2^3978955 is an apocalyptic number.

3978955 is a deficient number, since it is larger than the sum of its proper divisors (795797).

3978955 is an equidigital number, since it uses as much as digits as its factorization.

3978955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795796.

The product of its digits is 340200, while the sum is 46.

The square root of 3978955 is about 1994.7318115476. The cubic root of 3978955 is about 158.4612250780.

The spelling of 3978955 in words is "three million, nine hundred seventy-eight thousand, nine hundred fifty-five".