1528421 has 2 divisors, whose sum is σ = 1528422. Its totient is φ = 1528420.

The previous prime is 1528409. The next prime is 1528427. The reversal of 1528421 is 1248251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1079521 + 448900 = 1039^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1528421 - 2¹⁸ = 1266277 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1528427) 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, 764210 + 764211.

It is an arithmetic number, because the mean of its divisors is an integer number (764211).

2^1528421 is an apocalyptic number.

It is an amenable number.

1528421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1528421 is an equidigital number, since it uses as much as digits as its factorization.

1528421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 640, while the sum is 23.

The square root of 1528421 is about 1236.2932500018. The cubic root of 1528421 is about 115.1898816425.

The spelling of 1528421 in words is "one million, five hundred twenty-eight thousand, four hundred twenty-one".