1722369 has 32 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 950400.

The previous prime is 1722359. The next prime is 1722373. The reversal of 1722369 is 9632271.

It is not a de Polignac number, because 1722369 - 2⁷ = 1722241 is a prime.

It is a super-2 number, since 2×1722369² = 5933109944322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1722319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25674 + ... + 25740.

It is an arithmetic number, because the mean of its divisors is an integer number (85680).

It is a Proth number, since it is equal to 841 ⋅ 2¹¹ + 1 and 841 < 2¹¹.

2^1722369 is an apocalyptic number.

1722369 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1722369 is a deficient number, since it is larger than the sum of its proper divisors (1019391).

1722369 is a wasteful number, since it uses less digits than its factorization.

1722369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its digits is 4536, while the sum is 30.

The square root of 1722369 is about 1312.3905668664. The cubic root of 1722369 is about 119.8695109342.

The spelling of 1722369 in words is "one million, seven hundred twenty-two thousand, three hundred sixty-nine".