1378121808 has 80 divisors (see below), whose sum is σ = 4072882176. Its totient is φ = 393348480.

The previous prime is 1378121803. The next prime is 1378121863. The reversal of 1378121808 is 8081218731.

It is a super-3 number, since 3×1378121808³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378121803) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 530593 + ... + 533183.

Almost surely, 2^1378121808 is an apocalyptic number.

It is an amenable number.

1378121808 is an abundant number, since it is smaller than the sum of its proper divisors (2694760368).

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

1378121808 is a wasteful number, since it uses less digits than its factorization.

1378121808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192 (or 4186 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 1378121808 is about 37123.0630201766. The cubic root of 1378121808 is about 1112.8309654183.

The spelling of 1378121808 in words is "one billion, three hundred seventy-eight million, one hundred twenty-one thousand, eight hundred eight".