3661978 has 8 divisors (see below), whose sum is σ = 5502420. Its totient is φ = 1827840.

The previous prime is 3661963. The next prime is 3661979. The reversal of 3661978 is 8791663.

It can be written as a sum of positive squares in 2 ways, for example, as 3017169 + 644809 = 1737^2 + 803^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 3661978.

It is not an unprimeable number, because it can be changed into a prime (3661979) 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, 348 + ... + 2728.

Almost surely, 2^3661978 is an apocalyptic number.

3661978 is a deficient number, since it is larger than the sum of its proper divisors (1840442).

3661978 is a wasteful number, since it uses less digits than its factorization.

3661978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its digits is 54432, while the sum is 40.

The square root of 3661978 is about 1913.6295357252. The cubic root of 3661978 is about 154.1364114315.

The spelling of 3661978 in words is "three million, six hundred sixty-one thousand, nine hundred seventy-eight".