3651978 has 16 divisors (see below), whose sum is σ = 7968096. Its totient is φ = 1106640.

The previous prime is 3651959. The next prime is 3651979. The reversal of 3651978 is 8791563.

It is not an unprimeable number, because it can be changed into a prime (3651979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27601 + ... + 27732.

It is an arithmetic number, because the mean of its divisors is an integer number (498006).

Almost surely, 2^3651978 is an apocalyptic number.

3651978 is an abundant number, since it is smaller than the sum of its proper divisors (4316118).

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

3651978 is a wasteful number, since it uses less digits than its factorization.

3651978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55349.

The product of its digits is 45360, while the sum is 39.

The square root of 3651978 is about 1911.0149135996. The cubic root of 3651978 is about 153.9959801053.

It can be divided in two parts, 36519 and 78, that multiplied together give a palindrome (2848482).

The spelling of 3651978 in words is "three million, six hundred fifty-one thousand, nine hundred seventy-eight".