3978667 has 16 divisors (see below), whose sum is σ = 5006592. Its totient is φ = 3071520.

The previous prime is 3978659. The next prime is 3978671. The reversal of 3978667 is 7668793.

It is a cyclic number.

It is not a de Polignac number, because 3978667 - 2³ = 3978659 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 (3978167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12393 + ... + 12709.

It is an arithmetic number, because the mean of its divisors is an integer number (312912).

Almost surely, 2^3978667 is an apocalyptic number.

3978667 is a deficient number, since it is larger than the sum of its proper divisors (1027925).

3978667 is a wasteful number, since it uses less digits than its factorization.

3978667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498.

The product of its digits is 381024, while the sum is 46.

The square root of 3978667 is about 1994.6596200856. The cubic root of 3978667 is about 158.4574018016.

It can be divided in two parts, 39786 and 67, that multiplied together give a palindrome (2665662).

The spelling of 3978667 in words is "three million, nine hundred seventy-eight thousand, six hundred sixty-seven".