3978750 has 40 divisors (see below), whose sum is σ = 9953064. Its totient is φ = 1060000.

The previous prime is 3978749. The next prime is 3978761. The reversal of 3978750 is 578793.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3978699 and 3978708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3220 + ... + 4280.

Almost surely, 2^3978750 is an apocalyptic number.

3978750 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3978750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4976532).

3978750 is an abundant number, since it is smaller than the sum of its proper divisors (5974314).

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

3978750 is a wasteful number, since it uses less digits than its factorization.

3978750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 3978750 is about 1994.6804255319. The cubic root of 3978750 is about 158.4585036675.

The spelling of 3978750 in words is "three million, nine hundred seventy-eight thousand, seven hundred fifty".