6978537 has 6 divisors (see below), whose sum is σ = 10080122. Its totient is φ = 4652352.

The previous prime is 6978511. The next prime is 6978547. The reversal of 6978537 is 7358796.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5588496 + 1390041 = 2364^2 + 1179^2 .

It is not a de Polignac number, because 6978537 - 2⁸ = 6978281 is a prime.

It is a d-powerful number, because it can be written as 6³ + 9⁷ + 7² + 8⁷ + 5⁷ + 3⁹ + 7³ .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6978492 and 6978501.

It is not an unprimeable number, because it can be changed into a prime (6978547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 387688 + ... + 387705.

Almost surely, 2^6978537 is an apocalyptic number.

It is an amenable number.

6978537 is a deficient number, since it is larger than the sum of its proper divisors (3101585).

6978537 is a wasteful number, since it uses less digits than its factorization.

6978537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775399 (or 775396 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 6978537 is about 2641.6920713815. The cubic root of 6978537 is about 191.0974074389.

It can be divided in two parts, 69 and 78537, that added together give a triangular number (78606 = T₃₉₆).

The spelling of 6978537 in words is "six million, nine hundred seventy-eight thousand, five hundred thirty-seven".