1908090 has 64 divisors (see below), whose sum is σ = 5253120. Its totient is φ = 492480.

The previous prime is 1908089. The next prime is 1908091. The reversal of 1908090 is 908091.

It is an interprime number because it is at equal distance from previous prime (1908089) and next prime (1908091).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1908091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9895 + ... + 10085.

It is an arithmetic number, because the mean of its divisors is an integer number (82080).

2^1908090 is an apocalyptic number.

1908090 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 1908090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2626560).

1908090 is an abundant number, since it is smaller than the sum of its proper divisors (3345030).

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

1908090 is a wasteful number, since it uses less digits than its factorization.

1908090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 238 counting only the distinct ones).

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

The square root of 1908090 is about 1381.3363095206. The cubic root of 1908090 is about 124.0317729888.

Subtracting from 1908090 its reverse (908091), we obtain a palindrome (999999).

The spelling of 1908090 in words is "one million, nine hundred eight thousand, ninety".