1358921808 has 30 divisors (see below), whose sum is σ = 3803094074. Its totient is φ = 452973888.

The previous prime is 1358921803. The next prime is 1358921813. The reversal of 1358921808 is 8081298531.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1358921803) and next prime (1358921813).

It can be written as a sum of positive squares in only one way, i.e., 1243831824 + 115089984 = 35268^2 + 10728^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1358921801) 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 5 ways as a sum of consecutive naturals, for example, 4718335 + ... + 4718622.

Almost surely, 2^1358921808 is an apocalyptic number.

1358921808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1358921808 is an abundant number, since it is smaller than the sum of its proper divisors (2444172266).

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

1358921808 is a wasteful number, since it uses less digits than its factorization.

1358921808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9436971 (or 9436962 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 1358921808 is about 36863.5566379589. The cubic root of 1358921808 is about 1107.6387888850.

The spelling of 1358921808 in words is "one billion, three hundred fifty-eight million, nine hundred twenty-one thousand, eight hundred eight".