3978751 has 6 divisors (see below), whose sum is σ = 4628400. Its totient is φ = 3410316.

The previous prime is 3978749. The next prime is 3978761. The reversal of 3978751 is 1578793.

It is not a de Polignac number, because 3978751 - 2¹ = 3978749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40551 + ... + 40648.

It is an arithmetic number, because the mean of its divisors is an integer number (771400).

Almost surely, 2^3978751 is an apocalyptic number.

3978751 is a deficient number, since it is larger than the sum of its proper divisors (649649).

3978751 is an equidigital number, since it uses as much as digits as its factorization.

3978751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81213 (or 81206 counting only the distinct ones).

The product of its digits is 52920, while the sum is 40.

The square root of 3978751 is about 1994.6806761986. The cubic root of 3978751 is about 158.4585169429.

The spelling of 3978751 in words is "three million, nine hundred seventy-eight thousand, seven hundred fifty-one".