3978551 has 8 divisors (see below), whose sum is σ = 4083264. Its totient is φ = 3875040.

The previous prime is 3978523. The next prime is 3978553. The reversal of 3978551 is 1558793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3978551 - 2¹⁰ = 3977527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14225 + ... + 14501.

It is an arithmetic number, because the mean of its divisors is an integer number (510408).

Almost surely, 2^3978551 is an apocalyptic number.

3978551 is a deficient number, since it is larger than the sum of its proper divisors (104713).

3978551 is a wasteful number, since it uses less digits than its factorization.

3978551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 37800, while the sum is 38.

The square root of 3978551 is about 1994.6305422308. The cubic root of 3978551 is about 158.4558618187.

The spelling of 3978551 in words is "three million, nine hundred seventy-eight thousand, five hundred fifty-one".