1900990 has 32 divisors (see below), whose sum is σ = 4213440. Its totient is φ = 601344.

The previous prime is 1900981. The next prime is 1901021. The reversal of 1900990 is 990091.

It is a super-2 number, since 2×1900990² = 7227525960200, which contains 22 as substring.

1900990 is a modest number, since divided by 990 gives 190 as remainder.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 135 + ... + 1954.

It is an arithmetic number, because the mean of its divisors is an integer number (131670).

2^1900990 is an apocalyptic number.

1900990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1900990 is an abundant number, since it is smaller than the sum of its proper divisors (2312450).

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

1900990 is a wasteful number, since it uses less digits than its factorization.

1900990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 1900990 is about 1378.7639391861. The cubic root of 1900990 is about 123.8777410999.

The spelling of 1900990 in words is "one million, nine hundred thousand, nine hundred ninety".