2978739 has 18 divisors (see below), whose sum is σ = 4429620. Its totient is φ = 1928808.

The previous prime is 2978737. The next prime is 2978749. The reversal of 2978739 is 9378792.

It is not a de Polignac number, because 2978739 - 2¹ = 2978737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2978694 and 2978703.

It is not an unprimeable number, because it can be changed into a prime (2978737) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16552 + ... + 16730.

It is an arithmetic number, because the mean of its divisors is an integer number (246090).

2^2978739 is an apocalyptic number.

2978739 is a deficient number, since it is larger than the sum of its proper divisors (1450881).

2978739 is a wasteful number, since it uses less digits than its factorization.

2978739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271 (or 225 counting only the distinct ones).

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

The square root of 2978739 is about 1725.9023726735. The cubic root of 2978739 is about 143.8834415588.

The spelling of 2978739 in words is "two million, nine hundred seventy-eight thousand, seven hundred thirty-nine".