1622421 has 12 divisors (see below), whose sum is σ = 2377440. Its totient is φ = 1065960.

The previous prime is 1622419. The next prime is 1622431. The reversal of 1622421 is 1242261.

1622421 is a `hidden beast` number, since 1 + 622 + 42 + 1 = 666.

It is not a de Polignac number, because 1622421 - 2¹ = 1622419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1622394 and 1622403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 631 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (198120).

2^1622421 is an apocalyptic number.

It is an amenable number.

1622421 is a deficient number, since it is larger than the sum of its proper divisors (755019).

1622421 is a wasteful number, since it uses less digits than its factorization.

1622421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616 (or 2613 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1622421 is about 1273.7429096957. The cubic root of 1622421 is about 117.5045056368.

Adding to 1622421 its reverse (1242261), we get a palindrome (2864682).

The spelling of 1622421 in words is "one million, six hundred twenty-two thousand, four hundred twenty-one".