3947278 has 8 divisors (see below), whose sum is σ = 5932080. Its totient is φ = 1969920.

The previous prime is 3947233. The next prime is 3947297. The reversal of 3947278 is 8727493.

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

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3947278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258 + ... + 2821.

It is an arithmetic number, because the mean of its divisors is an integer number (741510).

Almost surely, 2^3947278 is an apocalyptic number.

3947278 is a deficient number, since it is larger than the sum of its proper divisors (1984802).

3947278 is a wasteful number, since it uses less digits than its factorization.

3947278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

The product of its digits is 84672, while the sum is 40.

The square root of 3947278 is about 1986.7757800014. The cubic root of 3947278 is about 158.0395937732.

It can be divided in two parts, 3947 and 278, that added together give a square (4225 = 65²).

The spelling of 3947278 in words is "three million, nine hundred forty-seven thousand, two hundred seventy-eight".