1019900 has 72 divisors (see below), whose sum is σ = 2666496. Its totient is φ = 331200.

The previous prime is 1019899. The next prime is 1019903. The reversal of 1019900 is 99101.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1019903) 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, 21677 + ... + 21723.

2^1019900 is an apocalyptic number.

1019900 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 1019900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1333248).

1019900 is an abundant number, since it is smaller than the sum of its proper divisors (1646596).

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

1019900 is a wasteful number, since it uses less digits than its factorization.

1019900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1019900 is about 1009.9009852456. The cubic root of 1019900 is about 100.6589812318.

It can be divided in two parts, 101 and 9900, that added together give a palindrome (10001).

The spelling of 1019900 in words is "one million, nineteen thousand, nine hundred".