1155420 has 108 divisors (see below), whose sum is σ = 4108104. Its totient is φ = 262080.

The previous prime is 1155419. The next prime is 1155431. The reversal of 1155420 is 245511.

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

It is a nialpdrome in base 14.

It is a zygodrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1155393 and 1155402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8755 + ... + 8885.

It is an arithmetic number, because the mean of its divisors is an integer number (38038).

2^1155420 is an apocalyptic number.

1155420 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 1155420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054052).

1155420 is an abundant number, since it is smaller than the sum of its proper divisors (2952684).

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

1155420 is a wasteful number, since it uses less digits than its factorization.

1155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 1155420 is about 1074.9046469339. The cubic root of 1155420 is about 104.9332909604.

Subtracting from 1155420 its reverse (245511), we obtain a palindrome (909909).

The spelling of 1155420 in words is "one million, one hundred fifty-five thousand, four hundred twenty".