1622381 has 4 divisors (see below), whose sum is σ = 1640700. Its totient is φ = 1604064.

The previous prime is 1622377. The next prime is 1622407. The reversal of 1622381 is 1832261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1144900 + 477481 = 1070^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622381 - 2² = 1622377 is a prime.

It is a super-2 number, since 2×1622381² = 5264240218322, which contains 22 as substring.

It is a Duffinian 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9026 + ... + 9203.

It is an arithmetic number, because the mean of its divisors is an integer number (410175).

2^1622381 is an apocalyptic number.

It is an amenable number.

1622381 is a deficient number, since it is larger than the sum of its proper divisors (18319).

1622381 is an equidigital number, since it uses as much as digits as its factorization.

1622381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18318.

The product of its digits is 576, while the sum is 23.

The square root of 1622381 is about 1273.7272078432. The cubic root of 1622381 is about 117.5035399567.

The spelling of 1622381 in words is "one million, six hundred twenty-two thousand, three hundred eighty-one".