1172720 has 40 divisors (see below), whose sum is σ = 2772144. Its totient is φ = 461312.

The previous prime is 1172713. The next prime is 1172749. The reversal of 1172720 is 272711.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1172692 and 1172701.

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, 8492 + ... + 8628.

2^1172720 is an apocalyptic number.

1172720 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 1172720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386072).

1172720 is an abundant number, since it is smaller than the sum of its proper divisors (1599424).

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

1172720 is a wasteful number, since it uses less digits than its factorization.

1172720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1172720 is about 1082.9219731818. The cubic root of 1172720 is about 105.4544175403.

Subtracting from 1172720 its reverse (272711), we obtain a palindrome (900009).

The spelling of 1172720 in words is "one million, one hundred seventy-two thousand, seven hundred twenty".