1350821 has 4 divisors (see below), whose sum is σ = 1368000. Its totient is φ = 1333644.

The previous prime is 1350809. The next prime is 1350823. The reversal of 1350821 is 1280531.

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: 1280531 = 7 ⋅182933.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1350821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1350793 and 1350802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1350823) 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, 8471 + ... + 8628.

It is an arithmetic number, because the mean of its divisors is an integer number (342000).

2^1350821 is an apocalyptic number.

It is an amenable number.

1350821 is a deficient number, since it is larger than the sum of its proper divisors (17179).

1350821 is an equidigital number, since it uses as much as digits as its factorization.

1350821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17178.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1350821 is about 1162.2482523110. The cubic root of 1350821 is about 110.5433447884.

The spelling of 1350821 in words is "one million, three hundred fifty thousand, eight hundred twenty-one".