1240621 has 2 divisors, whose sum is σ = 1240622. Its totient is φ = 1240620.

The previous prime is 1240607. The next prime is 1240637. The reversal of 1240621 is 1260421.

It is an a-pointer prime, because the next prime (1240637) can be obtained adding 1240621 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 455625 = 886^2 + 675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240595 and 1240604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620310 + 620311.

It is an arithmetic number, because the mean of its divisors is an integer number (620311).

2^1240621 is an apocalyptic number.

It is an amenable number.

1240621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240621 is an equidigital number, since it uses as much as digits as its factorization.

1240621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1240621 is about 1113.8316748953. The cubic root of 1240621 is about 107.4516386037.

The spelling of 1240621 in words is "one million, two hundred forty thousand, six hundred twenty-one".