2609978 has 16 divisors (see below), whose sum is σ = 4584384. Its totient is φ = 1091040.

The previous prime is 2609963. The next prime is 2609989. The reversal of 2609978 is 8799062.

It is a super-3 number, since 3×2609978³ = 53337394215569128056, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is an unprimeable number.

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, 1700 + ... + 2847.

It is an arithmetic number, because the mean of its divisors is an integer number (286524).

2^2609978 is an apocalyptic number.

2609978 is a deficient number, since it is larger than the sum of its proper divisors (1974406).

2609978 is a wasteful number, since it uses less digits than its factorization.

2609978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4597.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 2609978 is about 1615.5426332969. The cubic root of 2609978 is about 137.6825652058.

The spelling of 2609978 in words is "two million, six hundred nine thousand, nine hundred seventy-eight".