1990908 has 36 divisors (see below), whose sum is σ = 5208840. Its totient is φ = 640416.

The previous prime is 1990907. The next prime is 1990927. The reversal of 1990908 is 8090991.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990907) 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, 91 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (144690).

2^1990908 is an apocalyptic number.

1990908 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1990908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604420).

1990908 is an abundant number, since it is smaller than the sum of its proper divisors (3217932).

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

1990908 is a wasteful number, since it uses less digits than its factorization.

1990908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1990908 is about 1410.9953933305. The cubic root of 1990908 is about 125.8008949127.

The spelling of 1990908 in words is "one million, nine hundred ninety thousand, nine hundred eight".