1722224 has 20 divisors (see below), whose sum is σ = 3813744. Its totient is φ = 738048.

The previous prime is 1722211. The next prime is 1722241. The reversal of 1722224 is 4222271.

1722224 = T₄₈₉ + T₄₉₀ + ... + T₅₀₂.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1722196 and 1722205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7577 + ... + 7800.

2^1722224 is an apocalyptic number.

1722224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1722224 is an abundant number, since it is smaller than the sum of its proper divisors (2091520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1722224 is a wasteful number, since it uses less digits than its factorization.

1722224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15392 (or 15386 counting only the distinct ones).

The product of its digits is 448, while the sum is 20.

The square root of 1722224 is about 1312.3353230025. The cubic root of 1722224 is about 119.8661470467.

Adding to 1722224 its reverse (4222271), we get a palindrome (5944495).

The spelling of 1722224 in words is "one million, seven hundred twenty-two thousand, two hundred twenty-four".