1900805128 has 16 divisors (see below), whose sum is σ = 3565867500. Its totient is φ = 949907136.

The previous prime is 1900805119. The next prime is 1900805147. The reversal of 1900805128 is 8215080091.

It can be written as a sum of positive squares in 2 ways, for example, as 1852613764 + 48191364 = 43042^2 + 6942^2 .

It is a super-2 number, since 2×1900805128² = 7226120269262192768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1900805093 and 1900805102.

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, 45363 + ... + 76546.

Almost surely, 2^1900805128 is an apocalyptic number.

It is an amenable number.

1900805128 is a deficient number, since it is larger than the sum of its proper divisors (1665062372).

1900805128 is a wasteful number, since it uses less digits than its factorization.

1900805128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123864 (or 123860 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 1900805128 is about 43598.2239087787. The cubic root of 1900805128 is about 1238.7372525055.

The spelling of 1900805128 in words is "one billion, nine hundred million, eight hundred five thousand, one hundred twenty-eight".