1381115904 has 192 divisors, whose sum is σ = 4457980800. Its totient is φ = 371195904.

The previous prime is 1381115851. The next prime is 1381115959. The reversal of 1381115904 is 4095111831.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×1381115904² = 3814962280563474432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730192 + ... + 732080.

It is an arithmetic number, because the mean of its divisors is an integer number (23218650).

Almost surely, 2^1381115904 is an apocalyptic number.

1381115904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381115904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228990400).

1381115904 is an abundant number, since it is smaller than the sum of its proper divisors (3076864896).

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

1381115904 is a wasteful number, since it uses less digits than its factorization.

1381115904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1938 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 33.

The square root of 1381115904 is about 37163.3677698887. The cubic root of 1381115904 is about 1113.6362915904.

The spelling of 1381115904 in words is "one billion, three hundred eighty-one million, one hundred fifteen thousand, nine hundred four".