845401 has 4 divisors (see below), whose sum is σ = 872704. Its totient is φ = 818100.

The previous prime is 845387. The next prime is 845431. The reversal of 845401 is 104548.

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 845401 - 2¹⁵ = 812633 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 (845431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13605 + ... + 13666.

It is an arithmetic number, because the mean of its divisors is an integer number (218176).

2⁸⁴⁵⁴⁰¹ is an apocalyptic number.

It is an amenable number.

845401 is a deficient number, since it is larger than the sum of its proper divisors (27303).

845401 is a wasteful number, since it uses less digits than its factorization.

845401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27302.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 845401 is about 919.4569049172. The cubic root of 845401 is about 94.5556720567. Note that the first 3 decimals are identical.

Adding to 845401 its reverse (104548), we get a palindrome (949949).

The spelling of 845401 in words is "eight hundred forty-five thousand, four hundred one".