1422720 has 192 divisors, whose sum is σ = 5569200. Its totient is φ = 331776.

The previous prime is 1422709. The next prime is 1422721. The reversal of 1422720 is 272241.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1422693 and 1422702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1422721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74871 + ... + 74889.

2^1422720 is an apocalyptic number.

1422720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2784600).

1422720 is an abundant number, since it is smaller than the sum of its proper divisors (4146480).

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

1422720 is a wasteful number, since it uses less digits than its factorization.

1422720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 1422720 is about 1192.7782694198. The cubic root of 1422720 is about 112.4708072402.

Adding to 1422720 its reverse (272241), we get a palindrome (1694961).

The spelling of 1422720 in words is "one million, four hundred twenty-two thousand, seven hundred twenty".