990609408 has 96 divisors (see below), whose sum is σ = 2862568800. Its totient is φ = 330104832.

The previous prime is 990609391. The next prime is 990609419. The reversal of 990609408 is 804906099.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×990609408² = 1962613998436220928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293233 + ... + 296591.

It is an arithmetic number, because the mean of its divisors is an integer number (29818425).

Almost surely, 2^990609408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990609408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1431284400).

990609408 is an abundant number, since it is smaller than the sum of its proper divisors (1871959392).

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

990609408 is an equidigital number, since it uses as much as digits as its factorization.

990609408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395 (or 3364 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 990609408 is about 31473.9480840901. The cubic root of 990609408 is about 996.8599530923.

The spelling of 990609408 in words is "nine hundred ninety million, six hundred nine thousand, four hundred eight".