1890681 has 8 divisors (see below), whose sum is σ = 2714880. Its totient is φ = 1163472.

The previous prime is 1890677. The next prime is 1890697. The reversal of 1890681 is 1860981.

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

It is not a de Polignac number, because 1890681 - 2² = 1890677 is a prime.

It is a super-2 number, since 2×1890681² = 7149349287522, which contains 22 as substring.

1890681 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 (1890601) 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, 24201 + ... + 24278.

It is an arithmetic number, because the mean of its divisors is an integer number (339360).

2^1890681 is an apocalyptic number.

It is an amenable number.

1890681 is a deficient number, since it is larger than the sum of its proper divisors (824199).

1890681 is a wasteful number, since it uses less digits than its factorization.

1890681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48495.

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

The square root of 1890681 is about 1375.0203634856. The cubic root of 1890681 is about 123.6534069216.

The spelling of 1890681 in words is "one million, eight hundred ninety thousand, six hundred eighty-one".