2499978 has 16 divisors (see below), whose sum is σ = 5384736. Its totient is φ = 769200.

The previous prime is 2499967. The next prime is 2499983. The reversal of 2499978 is 8799942.

It is a happy number.

It is an Ulam number.

It is a Curzon 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, 15948 + ... + 16103.

It is an arithmetic number, because the mean of its divisors is an integer number (336546).

2^2499978 is an apocalyptic number.

2499978 is an abundant number, since it is smaller than the sum of its proper divisors (2884758).

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

2499978 is a wasteful number, since it uses less digits than its factorization.

2499978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32069.

The product of its digits is 326592, while the sum is 48.

The square root of 2499978 is about 1581.1318730580. The cubic root of 2499978 is about 135.7204827140.

The spelling of 2499978 in words is "two million, four hundred ninety-nine thousand, nine hundred seventy-eight".