921000040 has 32 divisors (see below), whose sum is σ = 2162350080. Its totient is φ = 352382272.

The previous prime is 921000029. The next prime is 921000077. The reversal of 921000040 is 40000129.

921000040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 920999978 and 921000023.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499624 + ... + 501463.

It is an arithmetic number, because the mean of its divisors is an integer number (67573440).

Almost surely, 2^921000040 is an apocalyptic number.

It is an amenable number.

921000040 is an abundant number, since it is smaller than the sum of its proper divisors (1241350040).

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

921000040 is a wasteful number, since it uses less digits than its factorization.

921000040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001121 (or 1001117 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 921000040 is about 30347.9824700094. The cubic root of 921000040 is about 972.9410999605.

Adding to 921000040 its reverse (40000129), we get a palindrome (961000169).

The spelling of 921000040 in words is "nine hundred twenty-one million, forty", and thus it is an aban number.