1042721928 has 96 divisors (see below), whose sum is σ = 3120249600. Its totient is φ = 312897024.

The previous prime is 1042721923. The next prime is 1042721929. The reversal of 1042721928 is 8291272401.

1042721928 is a `hidden beast` number, since 10 + 427 + 219 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1042721892 and 1042721901.

It is not an unprimeable number, because it can be changed into a prime (1042721923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9633 + ... + 46671.

It is an arithmetic number, because the mean of its divisors is an integer number (32502600).

Almost surely, 2^1042721928 is an apocalyptic number.

1042721928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1042721928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560124800).

1042721928 is an abundant number, since it is smaller than the sum of its proper divisors (2077527672).

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

1042721928 is a wasteful number, since it uses less digits than its factorization.

1042721928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37091 (or 37084 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1042721928 is about 32291.2051184220. The cubic root of 1042721928 is about 1014.0425270728.

The spelling of 1042721928 in words is "one billion, forty-two million, seven hundred twenty-one thousand, nine hundred twenty-eight".