1938090 has 64 divisors (see below), whose sum is σ = 5806080. Its totient is φ = 402240.

The previous prime is 1938073. The next prime is 1938103. The reversal of 1938090 is 908391.

1938090 = 41² + 42² + ... + 180².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 31 ways as a sum of consecutive naturals, for example, 1891 + ... + 2729.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1938090 is an apocalyptic number.

1938090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1938090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2903040).

1938090 is an abundant number, since it is smaller than the sum of its proper divisors (3867990).

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

1938090 is a wasteful number, since it uses less digits than its factorization.

1938090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1938090 is about 1392.1530088320. The cubic root of 1938090 is about 124.6784267680.

The spelling of 1938090 in words is "one million, nine hundred thirty-eight thousand, ninety".