1208421 has 6 divisors (see below), whose sum is σ = 1745510. Its totient is φ = 805608.

The previous prime is 1208413. The next prime is 1208423. The reversal of 1208421 is 1248021.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 22500 = 1089^2 + 150^2 .

It is not a de Polignac number, because 1208421 - 2³ = 1208413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1208394 and 1208403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1208423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67126 + ... + 67143.

2^1208421 is an apocalyptic number.

It is an amenable number.

1208421 is a deficient number, since it is larger than the sum of its proper divisors (537089).

1208421 is a wasteful number, since it uses less digits than its factorization.

1208421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134275 (or 134272 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1208421 is about 1099.2820384233. The cubic root of 1208421 is about 106.5138512699.

The spelling of 1208421 in words is "one million, two hundred eight thousand, four hundred twenty-one".