1242621 has 30 divisors (see below), whose sum is σ = 2007390. Its totient is φ = 765072.

The previous prime is 1242617. The next prime is 1242623. The reversal of 1242621 is 1262421.

1242621 is a `hidden beast` number, since 1 + 2 + 42 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 171396 = 1035^2 + 414^2 .

It is not a de Polignac number, because 1242621 - 2² = 1242617 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1242594 and 1242603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242623) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 42835 + ... + 42863.

It is an arithmetic number, because the mean of its divisors is an integer number (66913).

2^1242621 is an apocalyptic number.

It is an amenable number.

1242621 is a deficient number, since it is larger than the sum of its proper divisors (764769).

1242621 is an equidigital number, since it uses as much as digits as its factorization.

1242621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 55 counting only the distinct ones).

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

The square root of 1242621 is about 1114.7291150768. The cubic root of 1242621 is about 107.5093483848.

The spelling of 1242621 in words is "one million, two hundred forty-two thousand, six hundred twenty-one".