1622945 has 4 divisors (see below), whose sum is σ = 1947540. Its totient is φ = 1298352.

The previous prime is 1622917. The next prime is 1622947. The reversal of 1622945 is 5492261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5492261 = 43 ⋅127727.

It can be written as a sum of positive squares in 2 ways, for example, as 1002001 + 620944 = 1001^2 + 788^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622945 - 2¹² = 1618849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1622947) 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, 162290 + ... + 162299.

It is an arithmetic number, because the mean of its divisors is an integer number (486885).

2^1622945 is an apocalyptic number.

It is an amenable number.

1622945 is a deficient number, since it is larger than the sum of its proper divisors (324595).

1622945 is an equidigital number, since it uses as much as digits as its factorization.

1622945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324594.

The product of its digits is 4320, while the sum is 29.

The square root of 1622945 is about 1273.9485860897. The cubic root of 1622945 is about 117.5171545800.

The spelling of 1622945 in words is "one million, six hundred twenty-two thousand, nine hundred forty-five".