1623001 has 4 divisors (see below), whose sum is σ = 1625572. Its totient is φ = 1620432.

The previous prime is 1622987. The next prime is 1623023. The reversal of 1623001 is 1003261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 855625 + 767376 = 925^2 + 876^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623001 - 2¹⁵ = 1590233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1623071) 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, 391 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (406393).

2^1623001 is an apocalyptic number.

It is an amenable number.

1623001 is a deficient number, since it is larger than the sum of its proper divisors (2571).

1623001 is a wasteful number, since it uses less digits than its factorization.

1623001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2570.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1623001 is about 1273.9705648091. The cubic root of 1623001 is about 117.5185062144.

Adding to 1623001 its reverse (1003261), we get a palindrome (2626262).

The spelling of 1623001 in words is "one million, six hundred twenty-three thousand, one".