1217520 has 120 divisors (see below), whose sum is σ = 4352400. Its totient is φ = 304128.

The previous prime is 1217509. The next prime is 1217521. The reversal of 1217520 is 257121.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 1217493 and 1217502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217521) 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, 13636 + ... + 13724.

It is an arithmetic number, because the mean of its divisors is an integer number (36270).

2^1217520 is an apocalyptic number.

1217520 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 1217520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2176200).

1217520 is an abundant number, since it is smaller than the sum of its proper divisors (3134880).

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

1217520 is a wasteful number, since it uses less digits than its factorization.

1217520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 1217520 is about 1103.4128873636. The cubic root of 1217520 is about 106.7805207920.

The spelling of 1217520 in words is "one million, two hundred seventeen thousand, five hundred twenty".