1920921920 has 28 divisors (see below), whose sum is σ = 4574196084. Its totient is φ = 768368640.

The previous prime is 1920921883. The next prime is 1920921931. The reversal of 1920921920 is 291290291.

It can be written as a sum of positive squares in 2 ways, for example, as 617423104 + 1303498816 = 24848^2 + 36104^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3001121 + ... + 3001760.

Almost surely, 2^1920921920 is an apocalyptic number.

1920921920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1920921920 is an abundant number, since it is smaller than the sum of its proper divisors (2653274164).

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

1920921920 is an equidigital number, since it uses as much as digits as its factorization.

1920921920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6002898 (or 6002888 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1920921920 is about 43828.3232624749. The cubic root of 1920921920 is about 1243.0919024799.

The spelling of 1920921920 in words is "one billion, nine hundred twenty million, nine hundred twenty-one thousand, nine hundred twenty".