1621142 has 4 divisors (see below), whose sum is σ = 2431716. Its totient is φ = 810570.

The previous prime is 1621141. The next prime is 1621153. The reversal of 1621142 is 2411261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2411261 = 281 ⋅8581.

It is a self number, because there is not a number n which added to its sum of digits gives 1621142.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621141) 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 as a sum of consecutive naturals, namely, 405284 + ... + 405287.

It is an arithmetic number, because the mean of its divisors is an integer number (607929).

2^1621142 is an apocalyptic number.

1621142 is a deficient number, since it is larger than the sum of its proper divisors (810574).

1621142 is an equidigital number, since it uses as much as digits as its factorization.

1621142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810573.

The product of its digits is 96, while the sum is 17.

The square root of 1621142 is about 1273.2407470702. The cubic root of 1621142 is about 117.4736201531.

The spelling of 1621142 in words is "one million, six hundred twenty-one thousand, one hundred forty-two".