9897878 has 4 divisors (see below), whose sum is σ = 14846820. Its totient is φ = 4948938.

The previous prime is 9897863. The next prime is 9897887. The reversal of 9897878 is 8787989.

9897878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8787989 = 7 ⋅1255427.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2474468 + ... + 2474471.

It is an arithmetic number, because the mean of its divisors is an integer number (3711705).

Almost surely, 2^9897878 is an apocalyptic number.

9897878 is a deficient number, since it is larger than the sum of its proper divisors (4948942).

9897878 is a wasteful number, since it uses less digits than its factorization.

9897878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4948941.

The product of its digits is 2032128, while the sum is 56.

The square root of 9897878 is about 3146.0893185032. The cubic root of 9897878 is about 214.7075743232.

The spelling of 9897878 in words is "nine million, eight hundred ninety-seven thousand, eight hundred seventy-eight".