1722406 has 16 divisors (see below), whose sum is σ = 3126816. Its totient is φ = 694656.

The previous prime is 1722377. The next prime is 1722419. The reversal of 1722406 is 6042271.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3381 + ... + 3856.

It is an arithmetic number, because the mean of its divisors is an integer number (195426).

2^1722406 is an apocalyptic number.

1722406 is a deficient number, since it is larger than the sum of its proper divisors (1404410).

1722406 is a wasteful number, since it uses less digits than its factorization.

1722406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7263.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 1722406 is about 1312.4046632042. The cubic root of 1722406 is about 119.8703692753.

Adding to 1722406 its reverse (6042271), we get a palindrome (7764677).

The spelling of 1722406 in words is "one million, seven hundred twenty-two thousand, four hundred six".