1994845 has 4 divisors (see below), whose sum is σ = 2393820. Its totient is φ = 1595872.

The previous prime is 1994843. The next prime is 1994869. The reversal of 1994845 is 5484991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5484991 = 37 ⋅148243.

It can be written as a sum of positive squares in 2 ways, for example, as 956484 + 1038361 = 978^2 + 1019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994845 - 2¹ = 1994843 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1994798 and 1994807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994843) 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, 199480 + ... + 199489.

It is an arithmetic number, because the mean of its divisors is an integer number (598455).

2^1994845 is an apocalyptic number.

It is an amenable number.

1994845 is a deficient number, since it is larger than the sum of its proper divisors (398975).

1994845 is an equidigital number, since it uses as much as digits as its factorization.

1994845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398974.

The product of its digits is 51840, while the sum is 40.

The square root of 1994845 is about 1412.3898187115. The cubic root of 1994845 is about 125.8837636360.

It can be divided in two parts, 19 and 94845, that added together give a square (94864 = 308²).

The spelling of 1994845 in words is "one million, nine hundred ninety-four thousand, eight hundred forty-five".