1600421 has 2 divisors, whose sum is σ = 1600422. Its totient is φ = 1600420.

The previous prime is 1600393. The next prime is 1600433. The reversal of 1600421 is 1240061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 196 = 1265^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 1600421 - 2¹⁸ = 1338277 is a prime.

It is a super-2 number, since 2×1600421² = 5122694754482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1600396 and 1600405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1600451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800210 + 800211.

It is an arithmetic number, because the mean of its divisors is an integer number (800211).

2^1600421 is an apocalyptic number.

It is an amenable number.

1600421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1600421 is an equidigital number, since it uses as much as digits as its factorization.

1600421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1600421 is about 1265.0774679837. The cubic root of 1600421 is about 116.9709670578.

Adding to 1600421 its reverse (1240061), we get a palindrome (2840482).

The spelling of 1600421 in words is "one million, six hundred thousand, four hundred twenty-one".