1537421 has 2 divisors, whose sum is σ = 1537422. Its totient is φ = 1537420.

The previous prime is 1537411. The next prime is 1537427. The reversal of 1537421 is 1247351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1297321 + 240100 = 1139^2 + 490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1537421 - 2⁶ = 1537357 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1537427) 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 as a sum of consecutive naturals, namely, 768710 + 768711.

It is an arithmetic number, because the mean of its divisors is an integer number (768711).

2^1537421 is an apocalyptic number.

It is an amenable number.

1537421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1537421 is an equidigital number, since it uses as much as digits as its factorization.

1537421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 840, while the sum is 23.

The square root of 1537421 is about 1239.9278204799. The cubic root of 1537421 is about 115.4155351552.

The spelling of 1537421 in words is "one million, five hundred thirty-seven thousand, four hundred twenty-one".