1017421 has 4 divisors (see below), whose sum is σ = 1021372. Its totient is φ = 1013472.

The previous prime is 1017391. The next prime is 1017437. The reversal of 1017421 is 1247101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114921 + 902500 = 339^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1017421 - 2⁷ = 1017293 is a prime.

It is a Duffinian number.

1017421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1017395 and 1017404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017481) 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 in 3 ways as a sum of consecutive naturals, for example, 1560 + ... + 2113.

It is an arithmetic number, because the mean of its divisors is an integer number (255343).

2^1017421 is an apocalyptic number.

It is an amenable number.

1017421 is a deficient number, since it is larger than the sum of its proper divisors (3951).

1017421 is an equidigital number, since it uses as much as digits as its factorization.

1017421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 1017421 is about 1008.6728904853. The cubic root of 1017421 is about 100.5773601374.

The spelling of 1017421 in words is "one million, seventeen thousand, four hundred twenty-one".