1681427 has 4 divisors (see below), whose sum is σ = 1834296. Its totient is φ = 1528560.

The previous prime is 1681423. The next prime is 1681469. The reversal of 1681427 is 7241861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7241861 = 11 ⋅658351.

It is not a de Polignac number, because 1681427 - 2² = 1681423 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1681427.

It is not an unprimeable number, because it can be changed into a prime (1681423) 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, 76418 + ... + 76439.

It is an arithmetic number, because the mean of its divisors is an integer number (458574).

2^1681427 is an apocalyptic number.

1681427 is a deficient number, since it is larger than the sum of its proper divisors (152869).

1681427 is a wasteful number, since it uses less digits than its factorization.

1681427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152868.

The product of its digits is 2688, while the sum is 29.

The square root of 1681427 is about 1296.6985000377. The cubic root of 1681427 is about 118.9120881672.

The spelling of 1681427 in words is "one million, six hundred eighty-one thousand, four hundred twenty-seven".