1900900 has 18 divisors (see below), whose sum is σ = 4125170. Its totient is φ = 760320.

The previous prime is 1900891. The next prime is 1900903. The reversal of 1900900 is 90091.

It can be written as a sum of positive squares in 3 ways, for example, as 343396 + 1557504 = 586^2 + 1248^2 .

It is a super-2 number, since 2×1900900² = 7226841620000, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1900903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9405 + ... + 9604.

2^1900900 is an apocalyptic number.

1900900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1900900 is an abundant number, since it is smaller than the sum of its proper divisors (2224270).

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

1900900 is a wasteful number, since it uses less digits than its factorization.

1900900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19023 (or 19016 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 1900900 is about 1378.7313008705. The cubic root of 1900900 is about 123.8757861233.

Adding to 1900900 its reverse (90091), we get a palindrome (1990991).

The spelling of 1900900 in words is "one million, nine hundred thousand, nine hundred".