906421 has 2 divisors, whose sum is σ = 906422. Its totient is φ = 906420.

The previous prime is 906403. The next prime is 906427. The reversal of 906421 is 124609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 703921 + 202500 = 839^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 906421 - 2⁷ = 906293 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 906392 and 906401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (906427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 453210 + 453211.

It is an arithmetic number, because the mean of its divisors is an integer number (453211).

2⁹⁰⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

906421 is a deficient number, since it is larger than the sum of its proper divisors (1).

906421 is an equidigital number, since it uses as much as digits as its factorization.

906421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 906421 is about 952.0614475967. The cubic root of 906421 is about 96.7780022527.

The spelling of 906421 in words is "nine hundred six thousand, four hundred twenty-one".