3978757 has 4 divisors (see below), whose sum is σ = 4107136. Its totient is φ = 3850380.

The previous prime is 3978749. The next prime is 3978761. The reversal of 3978757 is 7578793.

It is a happy number.

3978757 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3978757 - 2³ = 3978749 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64143 + ... + 64204.

It is an arithmetic number, because the mean of its divisors is an integer number (1026784).

Almost surely, 2^3978757 is an apocalyptic number.

It is an amenable number.

3978757 is a deficient number, since it is larger than the sum of its proper divisors (128379).

3978757 is a wasteful number, since it uses less digits than its factorization.

3978757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128378.

The product of its digits is 370440, while the sum is 46.

The square root of 3978757 is about 1994.6821801981. The cubic root of 3978757 is about 158.4585965953.

The spelling of 3978757 in words is "three million, nine hundred seventy-eight thousand, seven hundred fifty-seven".