1900889857 has 8 divisors (see below), whose sum is σ = 1924105320. Its totient is φ = 1877715840.

The previous prime is 1900889849. The next prime is 1900889909. The reversal of 1900889857 is 7589880091.

It can be written as a sum of positive squares in 4 ways, for example, as 326308096 + 1574581761 = 18064^2 + 39681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1900889857 - 2³ = 1900889849 is a prime.

It is a super-2 number, since 2×1900889857² = 7226764496890960898, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1900889798 and 1900889807.

It is not an unprimeable number, because it can be changed into a prime (1900884857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87507 + ... + 107047.

It is an arithmetic number, because the mean of its divisors is an integer number (240513165).

Almost surely, 2^1900889857 is an apocalyptic number.

It is an amenable number.

1900889857 is a deficient number, since it is larger than the sum of its proper divisors (23215463).

1900889857 is a wasteful number, since it uses less digits than its factorization.

1900889857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20723.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The square root of 1900889857 is about 43599.1956003778. The cubic root of 1900889857 is about 1238.7556579358.

The spelling of 1900889857 in words is "one billion, nine hundred million, eight hundred eighty-nine thousand, eight hundred fifty-seven".