1101398256 has 240 divisors, whose sum is σ = 3743212800. Its totient is φ = 303730560.

The previous prime is 1101398209. The next prime is 1101398257. The reversal of 1101398256 is 6528931011.

1101398256 is a `hidden beast` number, since 1 + 10 + 1 + 398 + 256 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1101398256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101398257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2905875 + ... + 2906253.

It is an arithmetic number, because the mean of its divisors is an integer number (15596720).

Almost surely, 2^1101398256 is an apocalyptic number.

1101398256 is a gapful number since it is divisible by the number (16) 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 1101398256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1871606400).

1101398256 is an abundant number, since it is smaller than the sum of its proper divisors (2641814544).

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

1101398256 is a wasteful number, since it uses less digits than its factorization.

1101398256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1101398256 is about 33187.3207113801. The cubic root of 1101398256 is about 1032.7173217325.

The spelling of 1101398256 in words is "one billion, one hundred one million, three hundred ninety-eight thousand, two hundred fifty-six".