1365421 has 4 divisors (see below), whose sum is σ = 1368252. Its totient is φ = 1362592.

The previous prime is 1365383. The next prime is 1365431. The reversal of 1365421 is 1245631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1245631 = 197 ⋅6323.

It can be written as a sum of positive squares in 2 ways, for example, as 741321 + 624100 = 861^2 + 790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365421 - 2¹⁷ = 1234349 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1365392 and 1365401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365431) 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, 490 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (342063).

2^1365421 is an apocalyptic number.

It is an amenable number.

1365421 is a deficient number, since it is larger than the sum of its proper divisors (2831).

1365421 is an equidigital number, since it uses as much as digits as its factorization.

1365421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830.

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

The square root of 1365421 is about 1168.5123020319. The cubic root of 1365421 is about 110.9401782465.

The spelling of 1365421 in words is "one million, three hundred sixty-five thousand, four hundred twenty-one".