1208643904 has 56 divisors (see below), whose sum is σ = 2672013960. Its totient is φ = 538589184.

The previous prime is 1208643893. The next prime is 1208643911. The reversal of 1208643904 is 4093468021.

It can be written as a sum of positive squares in 4 ways, for example, as 8714304 + 1199929600 = 2952^2 + 34640^2 .

It is a super-2 number, since 2×1208643904² = 2921640173352722432, 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 7 ways as a sum of consecutive naturals, for example, 919 + ... + 49174.

It is an arithmetic number, because the mean of its divisors is an integer number (47714535).

Almost surely, 2^1208643904 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 1208643904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1336006980).

1208643904 is an abundant number, since it is smaller than the sum of its proper divisors (1463370056).

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

1208643904 is a wasteful number, since it uses less digits than its factorization.

1208643904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50147 (or 50137 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 1208643904 is about 34765.5562877973. The cubic root of 1208643904 is about 1065.2040000965.

The spelling of 1208643904 in words is "one billion, two hundred eight million, six hundred forty-three thousand, nine hundred four".