1200421 has 8 divisors (see below), whose sum is σ = 1280664. Its totient is φ = 1121280.

The previous prime is 1200403. The next prime is 1200443. The reversal of 1200421 is 1240021.

It can be written as a sum of positive squares in 4 ways, for example, as 792100 + 408321 = 890^2 + 639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1200421 - 2⁵ = 1200389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200398 and 1200407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3951 + ... + 4243.

It is an arithmetic number, because the mean of its divisors is an integer number (160083).

2^1200421 is an apocalyptic number.

1200421 is the 586-th nonagonal number.

It is an amenable number.

1200421 is a deficient number, since it is larger than the sum of its proper divisors (80243).

1200421 is a wasteful number, since it uses less digits than its factorization.

1200421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1200421 is about 1095.6372574899. The cubic root of 1200421 is about 106.2782826669.

Adding to 1200421 its reverse (1240021), we get a palindrome (2440442).

The spelling of 1200421 in words is "one million, two hundred thousand, four hundred twenty-one".