1255100 has 72 divisors (see below), whose sum is σ = 3416448. Its totient is φ = 388800.

The previous prime is 1255081. The next prime is 1255103. The reversal of 1255100 is 15521.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7619 + ... + 7781.

2^1255100 is an apocalyptic number.

1255100 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 1255100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708224).

1255100 is an abundant number, since it is smaller than the sum of its proper divisors (2161348).

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

1255100 is a wasteful number, since it uses less digits than its factorization.

1255100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 1255100 is about 1120.3124564156. The cubic root of 1255100 is about 107.8680372688.

It can be divided in two parts, 125 and 5100, that added together give a palindrome (5225).

The spelling of 1255100 in words is "one million, two hundred fifty-five thousand, one hundred".