921204040 has 16 divisors (see below), whose sum is σ = 2072709180. Its totient is φ = 368481600.

The previous prime is 921203963. The next prime is 921204043. The reversal of 921204040 is 40402129.

921204040 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 914578564 + 6625476 = 30242^2 + 2574^2 .

It is not an unprimeable number, because it can be changed into a prime (921204043) 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, 11515011 + ... + 11515090.

Almost surely, 2^921204040 is an apocalyptic number.

It is an amenable number.

921204040 is an abundant number, since it is smaller than the sum of its proper divisors (1151505140).

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

921204040 is a wasteful number, since it uses less digits than its factorization.

921204040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23030112 (or 23030108 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 921204040 is about 30351.3432981145. The cubic root of 921204040 is about 973.0129296106.

Adding to 921204040 its reverse (40402129), we get a palindrome (961606169).

The spelling of 921204040 in words is "nine hundred twenty-one million, two hundred four thousand, forty".