1621242 has 32 divisors (see below), whose sum is σ = 4118400. Its totient is φ = 463104.

The previous prime is 1621241. The next prime is 1621259. The reversal of 1621242 is 2421261.

1621242 is a `hidden beast` number, since 1 + 621 + 2 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1621241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767 + ... + 2522.

It is an arithmetic number, because the mean of its divisors is an integer number (128700).

2^1621242 is an apocalyptic number.

1621242 is an abundant number, since it is smaller than the sum of its proper divisors (2497158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621242 is a wasteful number, since it uses less digits than its factorization.

1621242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 4301 counting only the distinct ones).

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

The square root of 1621242 is about 1273.2800163358. The cubic root of 1621242 is about 117.4760355533.

The spelling of 1621242 in words is "one million, six hundred twenty-one thousand, two hundred forty-two".