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1994689 = 5773457
BaseRepresentation
bin111100110111111000001
310202100012101
413212333001
51002312224
6110430401
722645264
oct7467701
93670171
101994689
111142704
12802401
1354abb8
1439ccdb
15296044
hex1e6fc1

1994689 has 4 divisors (see below), whose sum is σ = 1998724. Its totient is φ = 1990656.

The previous prime is 1994687. The next prime is 1994711. The reversal of 1994689 is 9864991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9864991 = 37926029.

It can be written as a sum of positive squares in 2 ways, for example, as 1034289 + 960400 = 1017^2 + 980^2 .

It is a 3-Lehmer number, since φ(1994689) divides (1994689-1)3.

It is a cyclic number.

It is not a de Polignac number, because 1994689 - 21 = 1994687 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994687) 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 3 ways as a sum of consecutive naturals, for example, 1152 + ... + 2305.

It is an arithmetic number, because the mean of its divisors is an integer number (499681).

It is a Poulet number, since it divides 21994688-1.

21994689 is an apocalyptic number.

It is an amenable number.

1994689 is a deficient number, since it is larger than the sum of its proper divisors (4035).

1994689 is an equidigital number, since it uses as much as digits as its factorization.

1994689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034.

The product of its digits is 139968, while the sum is 46.

The square root of 1994689 is about 1412.3345920850. The cubic root of 1994689 is about 125.8804821147.

The spelling of 1994689 in words is "one million, nine hundred ninety-four thousand, six hundred eighty-nine".

Divisors: 1 577 3457 1994689