3969778 has 8 divisors (see below), whose sum is σ = 5966172. Its totient is φ = 1981056.

The previous prime is 3969773. The next prime is 3969787. The reversal of 3969778 is 8779693.

It can be written as a sum of positive squares in 2 ways, for example, as 3948169 + 21609 = 1987^2 + 147^2 .

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

It is not an unprimeable number, because it can be changed into a prime (3969773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375 + ... + 2842.

Almost surely, 2^3969778 is an apocalyptic number.

3969778 is a deficient number, since it is larger than the sum of its proper divisors (1996394).

3969778 is a wasteful number, since it uses less digits than its factorization.

3969778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836.

The product of its digits is 571536, while the sum is 49.

The square root of 3969778 is about 1992.4301744352. The cubic root of 3969778 is about 158.3393071307.

The spelling of 3969778 in words is "three million, nine hundred sixty-nine thousand, seven hundred seventy-eight".