947821640 has 16 divisors (see below), whose sum is σ = 2132598780. Its totient is φ = 379128640.

The previous prime is 947821627. The next prime is 947821657. The reversal of 947821640 is 46128749.

947821640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 932813764 + 15007876 = 30542^2 + 3874^2 .

It is a super-2 number, since 2×947821640² = 1796731722504579200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11847731 + ... + 11847810.

Almost surely, 2^947821640 is an apocalyptic number.

It is an amenable number.

947821640 is an abundant number, since it is smaller than the sum of its proper divisors (1184777140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

947821640 is a wasteful number, since it uses less digits than its factorization.

947821640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23695552 (or 23695548 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 947821640 is about 30786.7120686831. The cubic root of 947821640 is about 982.2956179746.

The spelling of 947821640 in words is "nine hundred forty-seven million, eight hundred twenty-one thousand, six hundred forty".