1229520 has 80 divisors (see below), whose sum is σ = 3928320. Its totient is φ = 317952.

The previous prime is 1229519. The next prime is 1229521. The reversal of 1229520 is 259221.

It is an interprime number because it is at equal distance from previous prime (1229519) and next prime (1229521).

It is a tau number, because it is divible by the number of its divisors (80).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11226 + ... + 11334.

It is an arithmetic number, because the mean of its divisors is an integer number (49104).

2^1229520 is an apocalyptic number.

1229520 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 1229520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1964160).

1229520 is an abundant number, since it is smaller than the sum of its proper divisors (2698800).

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

1229520 is a wasteful number, since it uses less digits than its factorization.

1229520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1229520 is about 1108.8372288122. The cubic root of 1229520 is about 107.1301877083.

Subtracting from 1229520 its reverse (259221), we obtain a cube (970299 = 99³).

The spelling of 1229520 in words is "one million, two hundred twenty-nine thousand, five hundred twenty".