1155381408 has 144 divisors (see below), whose sum is σ = 3517952256. Its totient is φ = 372625920.

The previous prime is 1155381407. The next prime is 1155381457. The reversal of 1155381408 is 8041835511.

1155381408 is a `hidden beast` number, since 115 + 538 + 1 + 4 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1155381407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238660 + ... + 243452.

It is an arithmetic number, because the mean of its divisors is an integer number (24430224).

Almost surely, 2^1155381408 is an apocalyptic number.

1155381408 is a gapful number since it is divisible by the number (18) 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 1155381408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1758976128).

1155381408 is an abundant number, since it is smaller than the sum of its proper divisors (2362570848).

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

1155381408 is an equidigital number, since it uses as much as digits as its factorization.

1155381408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4849 (or 4829 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 1155381408 is about 33990.9018415222. The cubic root of 1155381408 is about 1049.3212266070.

The spelling of 1155381408 in words is "one billion, one hundred fifty-five million, three hundred eighty-one thousand, four hundred eight".