1381979008 has 64 divisors (see below), whose sum is σ = 2919093120. Its totient is φ = 650557440.

The previous prime is 1381978991. The next prime is 1381979017. The reversal of 1381979008 is 8009791831.

It is a tau number, because it is divible by the number of its divisors (64).

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, 142110 + ... + 151522.

It is an arithmetic number, because the mean of its divisors is an integer number (45610830).

Almost surely, 2^1381979008 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 1381979008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1459546560).

1381979008 is an abundant number, since it is smaller than the sum of its proper divisors (1537114112).

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

1381979008 is an equidigital number, since it uses as much as digits as its factorization.

1381979008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495 (or 9483 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 46.

The square root of 1381979008 is about 37174.9782515068. The cubic root of 1381979008 is about 1113.8682257290.

The spelling of 1381979008 in words is "one billion, three hundred eighty-one million, nine hundred seventy-nine thousand, eight".