3978738 has 24 divisors (see below), whose sum is σ = 8805888. Its totient is φ = 1297752.

The previous prime is 3978727. The next prime is 3978739. The reversal of 3978738 is 8378793.

It is a junction number, because it is equal to n+sod(n) for n = 3978693 and 3978702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978739) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1506 + ... + 3197.

It is an arithmetic number, because the mean of its divisors is an integer number (366912).

Almost surely, 2^3978738 is an apocalyptic number.

3978738 is an abundant number, since it is smaller than the sum of its proper divisors (4827150).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3978738 is a wasteful number, since it uses less digits than its factorization.

3978738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4758 (or 4755 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 3978738 is about 1994.6774175290. The cubic root of 3978738 is about 158.4583443626.

The spelling of 3978738 in words is "three million, nine hundred seventy-eight thousand, seven hundred thirty-eight".