3609978 has 16 divisors (see below), whose sum is σ = 7469280. Its totient is φ = 1161776.

The previous prime is 3609973. The next prime is 3609997. The reversal of 3609978 is 8799063.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3609973) 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, 10200 + ... + 10547.

It is an arithmetic number, because the mean of its divisors is an integer number (466830).

Almost surely, 2^3609978 is an apocalyptic number.

3609978 is an abundant number, since it is smaller than the sum of its proper divisors (3859302).

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

3609978 is a wasteful number, since it uses less digits than its factorization.

3609978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20781.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 3609978 is about 1899.9942105175. The cubic root of 3609978 is about 153.4033528139.

The spelling of 3609978 in words is "three million, six hundred nine thousand, nine hundred seventy-eight".