3865978 has 16 divisors (see below), whose sum is σ = 6094080. Its totient is φ = 1835856.

The previous prime is 3865969. The next prime is 3865991. The reversal of 3865978 is 8795683.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a d-powerful number, because it can be written as 3¹³ + 8³ + 6⁶ + 5⁵ + 9⁴ + 7⁶ + 8⁷ .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10351 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (380880).

Almost surely, 2^3865978 is an apocalyptic number.

3865978 is a deficient number, since it is larger than the sum of its proper divisors (2228102).

3865978 is a wasteful number, since it uses less digits than its factorization.

3865978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621.

The product of its digits is 362880, while the sum is 46.

The square root of 3865978 is about 1966.2090428029. The cubic root of 3865978 is about 156.9470388122.

The spelling of 3865978 in words is "three million, eight hundred sixty-five thousand, nine hundred seventy-eight".