1608638398 has 8 divisors (see below), whose sum is σ = 2414240640. Its totient is φ = 803891520.

The previous prime is 1608638393. The next prime is 1608638399. The reversal of 1608638398 is 8938368061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608638393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209118 + ... + 216673.

It is an arithmetic number, because the mean of its divisors is an integer number (301780080).

Almost surely, 2^1608638398 is an apocalyptic number.

1608638398 is a deficient number, since it is larger than the sum of its proper divisors (805602242).

1608638398 is a wasteful number, since it uses less digits than its factorization.

1608638398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427682.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 1608638398 is about 40107.8346211809. The cubic root of 1608638398 is about 1171.7082209000.

The spelling of 1608638398 in words is "one billion, six hundred eight million, six hundred thirty-eight thousand, three hundred ninety-eight".