1536421 has 4 divisors (see below), whose sum is σ = 1540000. Its totient is φ = 1532844.

The previous prime is 1536401. The next prime is 1536439. The reversal of 1536421 is 1246351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1536421 - 2⁵ = 1536389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1536392 and 1536401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1536401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (385000).

2^1536421 is an apocalyptic number.

It is an amenable number.

1536421 is a deficient number, since it is larger than the sum of its proper divisors (3579).

1536421 is an equidigital number, since it uses as much as digits as its factorization.

1536421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578.

The product of its digits is 720, while the sum is 22.

The square root of 1536421 is about 1239.5245056069. The cubic root of 1536421 is about 115.3905061038.

The spelling of 1536421 in words is "one million, five hundred thirty-six thousand, four hundred twenty-one".