2978398439 has 12 divisors (see below), whose sum is σ = 3112015680. Its totient is φ = 2847192480.

The previous prime is 2978398433. The next prime is 2978398459. The reversal of 2978398439 is 9348938792.

It is a de Polignac number, because none of the positive numbers 2^k-2978398439 is a prime.

It is a super-2 number, since 2×2978398439² = 17741714522875273442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978398433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2866082 + ... + 2867120.

It is an arithmetic number, because the mean of its divisors is an integer number (259334640).

Almost surely, 2^2978398439 is an apocalyptic number.

2978398439 is a deficient number, since it is larger than the sum of its proper divisors (133617241).

2978398439 is an frugal number, since it uses more digits than its factorization.

2978398439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198 (or 1159 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 62.

The square root of 2978398439 is about 54574.7051205959. The cubic root of 2978398439 is about 1438.7795792332.

The spelling of 2978398439 in words is "two billion, nine hundred seventy-eight million, three hundred ninety-eight thousand, four hundred thirty-nine".