3653978 has 8 divisors (see below), whose sum is σ = 5535540. Its totient is φ = 1808800.

The previous prime is 3653977. The next prime is 3653981. The reversal of 3653978 is 8793563.

It can be written as a sum of positive squares in 2 ways, for example, as 2699449 + 954529 = 1643^2 + 977^2 .

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 (3653977) 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, 8843 + ... + 9246.

Almost surely, 2^3653978 is an apocalyptic number.

3653978 is a deficient number, since it is larger than the sum of its proper divisors (1881562).

3653978 is a wasteful number, since it uses less digits than its factorization.

3653978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18192.

The product of its digits is 136080, while the sum is 41.

The square root of 3653978 is about 1911.5381241294. The cubic root of 3653978 is about 154.0240868604.

The spelling of 3653978 in words is "three million, six hundred fifty-three thousand, nine hundred seventy-eight".