2309978 has 8 divisors (see below), whose sum is σ = 3780000. Its totient is φ = 1049980.

The previous prime is 2309969. The next prime is 2309999. The reversal of 2309978 is 8799032.

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

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 3 ways as a sum of consecutive naturals, for example, 52478 + ... + 52521.

It is an arithmetic number, because the mean of its divisors is an integer number (472500).

2^2309978 is an apocalyptic number.

2309978 is a deficient number, since it is larger than the sum of its proper divisors (1470022).

2309978 is a wasteful number, since it uses less digits than its factorization.

2309978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105012.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2309978 is about 1519.8611778712. The cubic root of 2309978 is about 132.1912211711.

The spelling of 2309978 in words is "two million, three hundred nine thousand, nine hundred seventy-eight".