3978835 has 16 divisors (see below), whose sum is σ = 5529600. Its totient is φ = 2691936.

The previous prime is 3978823. The next prime is 3978841. The reversal of 3978835 is 5388793.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3978835 - 2⁵ = 3978803 is a prime.

It is a super-2 number, since 2×3978835² = 31662255914450, which contains 22 as substring.

3978835 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3978791 and 3978800.

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 in 15 ways as a sum of consecutive naturals, for example, 2046 + ... + 3484.

It is an arithmetic number, because the mean of its divisors is an integer number (345600).

Almost surely, 2^3978835 is an apocalyptic number.

3978835 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3978835 is a deficient number, since it is larger than the sum of its proper divisors (1550765).

3978835 is a wasteful number, since it uses less digits than its factorization.

3978835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530.

The product of its digits is 181440, while the sum is 43.

The square root of 3978835 is about 1994.7017320893. The cubic root of 3978835 is about 158.4596320686.

The spelling of 3978835 in words is "three million, nine hundred seventy-eight thousand, eight hundred thirty-five".