1900090 has 16 divisors (see below), whose sum is σ = 3621672. Its totient is φ = 715264.

The previous prime is 1900079. The next prime is 1900111. The reversal of 1900090 is 900091.

It can be written as a sum of positive squares in 4 ways, for example, as 1879641 + 20449 = 1371^2 + 143^2 .

It is a super-2 number, since 2×1900090² = 7220684016200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5419 + ... + 5758.

2^1900090 is an apocalyptic number.

1900090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1900090 is a deficient number, since it is larger than the sum of its proper divisors (1721582).

1900090 is a wasteful number, since it uses less digits than its factorization.

1900090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11201.

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

The square root of 1900090 is about 1378.4375212537. The cubic root of 1900090 is about 123.8581885569.

Subtracting from 1900090 its reverse (900091), we obtain a palindrome (999999).

The spelling of 1900090 in words is "one million, nine hundred thousand, ninety".