3886978 has 4 divisors (see below), whose sum is σ = 5830470. Its totient is φ = 1943488.

The previous prime is 3886951. The next prime is 3886991. The reversal of 3886978 is 8796883.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8796883 = 643 ⋅13681.

It can be written as a sum of positive squares in only one way, i.e., 3598609 + 288369 = 1897^2 + 537^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 971743 + ... + 971746.

Almost surely, 2^3886978 is an apocalyptic number.

3886978 is a deficient number, since it is larger than the sum of its proper divisors (1943492).

3886978 is a wasteful number, since it uses less digits than its factorization.

3886978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943491.

The product of its digits is 580608, while the sum is 49.

The square root of 3886978 is about 1971.5420360723. The cubic root of 3886978 is about 157.2307046792.

The spelling of 3886978 in words is "three million, eight hundred eighty-six thousand, nine hundred seventy-eight".