2799978 has 16 divisors (see below), whose sum is σ = 5719680. Its totient is φ = 913376.

The previous prime is 2799977. The next prime is 2799989. The reversal of 2799978 is 8799972.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2799978.

It is not an unprimeable number, because it can be changed into a prime (2799977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4683 + ... + 5246.

It is an arithmetic number, because the mean of its divisors is an integer number (357480).

2^2799978 is an apocalyptic number.

2799978 is an abundant number, since it is smaller than the sum of its proper divisors (2919702).

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

2799978 is a wasteful number, since it uses less digits than its factorization.

2799978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9981.

The product of its digits is 571536, while the sum is 51.

The square root of 2799978 is about 1673.3134792979. The cubic root of 2799978 is about 140.9456054961.

The spelling of 2799978 in words is "two million, seven hundred ninety-nine thousand, nine hundred seventy-eight".