1490821 has 4 divisors (see below), whose sum is σ = 1538944. Its totient is φ = 1442700.

The previous prime is 1490813. The next prime is 1490833. The reversal of 1490821 is 1280941.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1280941 = 193 ⋅6637.

It is a cyclic number.

It is not a de Polignac number, because 1490821 - 2³ = 1490813 is a prime.

It is a Duffinian number.

1490821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1490921) 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 in 3 ways as a sum of consecutive naturals, for example, 24015 + ... + 24076.

It is an arithmetic number, because the mean of its divisors is an integer number (384736).

2^1490821 is an apocalyptic number.

It is an amenable number.

1490821 is a deficient number, since it is larger than the sum of its proper divisors (48123).

1490821 is an equidigital number, since it uses as much as digits as its factorization.

1490821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48122.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1490821 is about 1220.9918099643. The cubic root of 1490821 is about 114.2374500816.

The spelling of 1490821 in words is "one million, four hundred ninety thousand, eight hundred twenty-one".