1622391 has 8 divisors (see below), whose sum is σ = 2277120. Its totient is φ = 1024632.

The previous prime is 1622377. The next prime is 1622407. The reversal of 1622391 is 1932261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1622391 - 2⁵ = 1622359 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622311) 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 7 ways as a sum of consecutive naturals, for example, 14175 + ... + 14288.

It is an arithmetic number, because the mean of its divisors is an integer number (284640).

2^1622391 is an apocalyptic number.

1622391 is a deficient number, since it is larger than the sum of its proper divisors (654729).

1622391 is a wasteful number, since it uses less digits than its factorization.

1622391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28485.

The product of its digits is 648, while the sum is 24.

The square root of 1622391 is about 1273.7311333245. The cubic root of 1622391 is about 117.5037813782.

The spelling of 1622391 in words is "one million, six hundred twenty-two thousand, three hundred ninety-one".