1555830 has 48 divisors (see below), whose sum is σ = 4127760. Its totient is φ = 406464.

The previous prime is 1555819. The next prime is 1555831. The reversal of 1555830 is 385551.

It is a junction number, because it is equal to n+sod(n) for n = 1555794 and 1555803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555831) 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, 5164 + ... + 5456.

It is an arithmetic number, because the mean of its divisors is an integer number (85995).

2^1555830 is an apocalyptic number.

1555830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2063880).

1555830 is an abundant number, since it is smaller than the sum of its proper divisors (2571930).

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

1555830 is a wasteful number, since it uses less digits than its factorization.

1555830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 1555830 is about 1247.3291466169. The cubic root of 1555830 is about 115.8743685446.

The spelling of 1555830 in words is "one million, five hundred fifty-five thousand, eight hundred thirty".