1011889920 has 72 divisors (see below), whose sum is σ = 3231735696. Its totient is φ = 269836288.

The previous prime is 1011889913. The next prime is 1011889937. The reversal of 1011889920 is 299881101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127917 + ... + 135596.

It is an arithmetic number, because the mean of its divisors is an integer number (44885218).

Almost surely, 2^1011889920 is an apocalyptic number.

1011889920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011889920 is an abundant number, since it is smaller than the sum of its proper divisors (2219845776).

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

1011889920 is an equidigital number, since it uses as much as digits as its factorization.

1011889920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263537 (or 263523 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 1011889920 is about 31810.2172265453. The cubic root of 1011889920 is about 1003.9477018096.

The spelling of 1011889920 in words is "one billion, eleven million, eight hundred eighty-nine thousand, nine hundred twenty".