1716421 has 12 divisors (see below), whose sum is σ = 2084832. Its totient is φ = 1406328.

The previous prime is 1716419. The next prime is 1716427. The reversal of 1716421 is 1246171.

It is not a de Polignac number, because 1716421 - 2¹ = 1716419 is a prime.

It is a super-2 number, since 2×1716421² = 5892202098482, which contains 22 as substring.

It is a Duffinian number.

1716421 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1716392 and 1716401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1716427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 366 + ... + 1888.

It is an arithmetic number, because the mean of its divisors is an integer number (173736).

2^1716421 is an apocalyptic number.

It is an amenable number.

1716421 is a deficient number, since it is larger than the sum of its proper divisors (368411).

1716421 is a wasteful number, since it uses less digits than its factorization.

1716421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1553 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 1716421 is about 1310.1225133551. The cubic root of 1716421 is about 119.7313666758.

The spelling of 1716421 in words is "one million, seven hundred sixteen thousand, four hundred twenty-one".