1900890 has 24 divisors (see below), whose sum is σ = 4942548. Its totient is φ = 506880.

The previous prime is 1900879. The next prime is 1900891. The reversal of 1900890 is 980091.

It can be written as a sum of positive squares in 2 ways, for example, as 1896129 + 4761 = 1377^2 + 69^2 .

It is a super-2 number, since 2×1900890² = 7226765584200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1900891) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10471 + ... + 10650.

2^1900890 is an apocalyptic number.

1900890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1900890 is an abundant number, since it is smaller than the sum of its proper divisors (3041658).

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

1900890 is a wasteful number, since it uses less digits than its factorization.

1900890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21134 (or 21131 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1900890 is about 1378.7276743433. The cubic root of 1900890 is about 123.8755688999.

The spelling of 1900890 in words is "one million, nine hundred thousand, eight hundred ninety".