1000921428 has 288 divisors, whose sum is σ = 3049804800. Its totient is φ = 283046400.

The previous prime is 1000921421. The next prime is 1000921487. The reversal of 1000921428 is 8241290001.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000921421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16408518 + ... + 16408578.

It is an arithmetic number, because the mean of its divisors is an integer number (10589600).

Almost surely, 2^1000921428 is an apocalyptic number.

1000921428 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 1000921428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1524902400).

1000921428 is an abundant number, since it is smaller than the sum of its proper divisors (2048883372).

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

1000921428 is a wasteful number, since it uses less digits than its factorization.

1000921428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1000921428 is about 31637.3423030444. The cubic root of 1000921428 is about 1000.3070483783.

The spelling of 1000921428 in words is "one billion, nine hundred twenty-one thousand, four hundred twenty-eight".