2739978 has 36 divisors (see below), whose sum is σ = 6182358. Its totient is φ = 876960.

The previous prime is 2739977. The next prime is 2739983. The reversal of 2739978 is 8799372.

2739978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1580049 + 1159929 = 1257^2 + 1077^2 .

It is not an unprimeable number, because it can be changed into a prime (2739973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15048 + ... + 15228.

2^2739978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2739978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3091179).

2739978 is an abundant number, since it is smaller than the sum of its proper divisors (3442380).

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

2739978 is a wasteful number, since it uses less digits than its factorization.

2739978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247 (or 215 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 2739978 is about 1655.2878903683. The cubic root of 2739978 is about 139.9315651926.

The spelling of 2739978 in words is "two million, seven hundred thirty-nine thousand, nine hundred seventy-eight".