9478986921 has 12 divisors (see below), whose sum is σ = 13692806400. Its totient is φ = 6318892440.

The previous prime is 9478986859. The next prime is 9478986961. The reversal of 9478986921 is 1296898749.

It is not a de Polignac number, because 9478986921 - 2⁷ = 9478986793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9478986961) 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, 157776 + ... + 209406.

It is an arithmetic number, because the mean of its divisors is an integer number (1141067200).

Almost surely, 2^9478986921 is an apocalyptic number.

It is an amenable number.

9478986921 is a deficient number, since it is larger than the sum of its proper divisors (4213819479).

9478986921 is a wasteful number, since it uses less digits than its factorization.

9478986921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72036 (or 72033 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 63.

The square root of 9478986921 is about 97360.0889533283. The cubic root of 9478986921 is about 2116.3491008672.

The spelling of 9478986921 in words is "nine billion, four hundred seventy-eight million, nine hundred eighty-six thousand, nine hundred twenty-one".