1900086861 has 16 divisors (see below), whose sum is σ = 2552205248. Its totient is φ = 1257379200.

The previous prime is 1900086857. The next prime is 1900086883. The reversal of 1900086861 is 1686800091.

It is not a de Polignac number, because 1900086861 - 2² = 1900086857 is a prime.

It is a super-2 number, since 2×1900086861² = 7220660158689666642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900084861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247521 + ... + 255081.

It is an arithmetic number, because the mean of its divisors is an integer number (159512828).

Almost surely, 2^1900086861 is an apocalyptic number.

It is an amenable number.

1900086861 is a deficient number, since it is larger than the sum of its proper divisors (652118387).

1900086861 is a wasteful number, since it uses less digits than its factorization.

1900086861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8172.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1900086861 is about 43589.9857880225. The cubic root of 1900086861 is about 1238.5812035114.

The spelling of 1900086861 in words is "one billion, nine hundred million, eighty-six thousand, eight hundred sixty-one".