1560421 has 2 divisors, whose sum is σ = 1560422. Its totient is φ = 1560420.

The previous prime is 1560409. The next prime is 1560443. The reversal of 1560421 is 1240651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1050625 + 509796 = 1025^2 + 714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1560421 - 2¹⁷ = 1429349 is a prime.

1560421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1560121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780210 + 780211.

It is an arithmetic number, because the mean of its divisors is an integer number (780211).

2^1560421 is an apocalyptic number.

It is an amenable number.

1560421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1560421 is an equidigital number, since it uses as much as digits as its factorization.

1560421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 1560421 is about 1249.1681231924. The cubic root of 1560421 is about 115.9882320603.

It can be divided in two parts, 15604 and 21, that added together give a 6-th power (15625 = 5⁶).

The spelling of 1560421 in words is "one million, five hundred sixty thousand, four hundred twenty-one".