3978836 has 6 divisors (see below), whose sum is σ = 6962970. Its totient is φ = 1989416.

The previous prime is 3978823. The next prime is 3978841. The reversal of 3978836 is 6388793.

It can be written as a sum of positive squares in only one way, i.e., 2755600 + 1223236 = 1660^2 + 1106^2 .

It is a super-2 number, since 2×3978836² = 31662271829792, which contains 22 as substring.

It is a d-powerful number, because it can be written as 3⁸ + 9 + 7³ + 8³ + 8⁷ + 3¹³ + 6⁷ .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497351 + ... + 497358.

It is an arithmetic number, because the mean of its divisors is an integer number (1160495).

Almost surely, 2^3978836 is an apocalyptic number.

It is an amenable number.

3978836 is a deficient number, since it is larger than the sum of its proper divisors (2984134).

3978836 is a wasteful number, since it uses less digits than its factorization.

3978836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994713 (or 994711 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 3978836 is about 1994.7019827533. The cubic root of 3978836 is about 158.4596453438.

The spelling of 3978836 in words is "three million, nine hundred seventy-eight thousand, eight hundred thirty-six".