3965778 has 24 divisors (see below), whose sum is σ = 8756748. Its totient is φ = 1296672.

The previous prime is 3965723. The next prime is 3965783. The reversal of 3965778 is 8775693.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3932289 + 33489 = 1983^2 + 183^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1125 + ... + 3032.

Almost surely, 2^3965778 is an apocalyptic number.

3965778 is an abundant number, since it is smaller than the sum of its proper divisors (4790970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3965778 is a wasteful number, since it uses less digits than its factorization.

3965778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218 (or 4215 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 3965778 is about 1991.4261221547. The cubic root of 3965778 is about 158.2861076761.

The spelling of 3965778 in words is "three million, nine hundred sixty-five thousand, seven hundred seventy-eight".