2539978 has 16 divisors (see below), whose sum is σ = 4374720. Its totient is φ = 1083456.

The previous prime is 2539963. The next prime is 2539981. The reversal of 2539978 is 8799352.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5650 + ... + 6082.

It is an arithmetic number, because the mean of its divisors is an integer number (273420).

2^2539978 is an apocalyptic number.

2539978 is a deficient number, since it is larger than the sum of its proper divisors (1834742).

2539978 is a wasteful number, since it uses less digits than its factorization.

2539978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861.

The product of its digits is 136080, while the sum is 43.

The square root of 2539978 is about 1593.7308430221. The cubic root of 2539978 is about 136.4405050513.

The spelling of 2539978 in words is "two million, five hundred thirty-nine thousand, nine hundred seventy-eight".