1890000681 has 4 divisors (see below), whose sum is σ = 2520000912. Its totient is φ = 1260000452.

The previous prime is 1890000649. The next prime is 1890000683. The reversal of 1890000681 is 1860000981.

1890000681 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1890000681 - 2⁵ = 1890000649 is a prime.

It is a super-2 number, since 2×1890000681² = 7144205148360927522, which contains 22 as substring.

1890000681 is a strobogrammatic number because it is the same when read upside-down.

It is not an unprimeable number, because it can be changed into a prime (1890000683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315000111 + ... + 315000116.

It is an arithmetic number, because the mean of its divisors is an integer number (630000228).

Almost surely, 2^1890000681 is an apocalyptic number.

It is an amenable number.

1890000681 is a deficient number, since it is larger than the sum of its proper divisors (630000231).

1890000681 is an equidigital number, since it uses as much as digits as its factorization.

1890000681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630000230.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1890000681 is about 43474.1380708117. The cubic root of 1890000681 is about 1236.3857384397.

The spelling of 1890000681 in words is "one billion, eight hundred ninety million, six hundred eighty-one", and thus it is an aban number.