338691990 has 128 divisors (see below), whose sum is σ = 1011548160. Its totient is φ = 70668288.

The previous prime is 338691959. The next prime is 338692027. The reversal of 338691990 is 99196833.

It is a happy number.

338691990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×338691990² = 229424528180320200, which contains 22 as substring.

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 264171 + ... + 265449.

It is an arithmetic number, because the mean of its divisors is an integer number (7902720).

Almost surely, 2^338691990 is an apocalyptic number.

338691990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 338691990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (505774080).

338691990 is an abundant number, since it is smaller than the sum of its proper divisors (672856170).

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

338691990 is a wasteful number, since it uses less digits than its factorization.

338691990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 338691990 is about 18403.5863352772. The cubic root of 338691990 is about 697.0570252919.

The spelling of 338691990 in words is "three hundred thirty-eight million, six hundred ninety-one thousand, nine hundred ninety".