9978013 has 4 divisors (see below), whose sum is σ = 10066428. Its totient is φ = 9889600.

The previous prime is 9977999. The next prime is 9978037. The reversal of 9978013 is 3108799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3108799 = 19 ⋅163621.

It can be written as a sum of positive squares in 2 ways, for example, as 1923769 + 8054244 = 1387^2 + 2838^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9978013 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44038 + ... + 44263.

It is an arithmetic number, because the mean of its divisors is an integer number (2516607).

Almost surely, 2^9978013 is an apocalyptic number.

It is an amenable number.

9978013 is a deficient number, since it is larger than the sum of its proper divisors (88415).

9978013 is a wasteful number, since it uses less digits than its factorization.

9978013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88414.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 9978013 is about 3158.7992972014. The cubic root of 9978013 is about 215.2854546194.

The spelling of 9978013 in words is "nine million, nine hundred seventy-eight thousand, thirteen".