3978517 has 8 divisors (see below), whose sum is σ = 4253760. Its totient is φ = 3711840.

The previous prime is 3978511. The next prime is 3978523. The reversal of 3978517 is 7158793.

It is an interprime number because it is at equal distance from previous prime (3978511) and next prime (3978523).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3978517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3978517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3978511) 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, 1167 + ... + 3052.

It is an arithmetic number, because the mean of its divisors is an integer number (531720).

Almost surely, 2^3978517 is an apocalyptic number.

It is an amenable number.

3978517 is a deficient number, since it is larger than the sum of its proper divisors (275243).

3978517 is a wasteful number, since it uses less digits than its factorization.

3978517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4283.

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

The square root of 3978517 is about 1994.6220193310. The cubic root of 3978517 is about 158.4554104388.

The spelling of 3978517 in words is "three million, nine hundred seventy-eight thousand, five hundred seventeen".