1101399156 has 72 divisors (see below), whose sum is σ = 3270837024. Its totient is φ = 308082240.

The previous prime is 1101399139. The next prime is 1101399157. The reversal of 1101399156 is 6519931011.

It is a happy number.

1101399156 is a `hidden beast` number, since 110 + 1 + 399 + 156 = 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 1101399156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101399157) 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 23 ways as a sum of consecutive naturals, for example, 101826 + ... + 112121.

It is an arithmetic number, because the mean of its divisors is an integer number (45428292).

Almost surely, 2^1101399156 is an apocalyptic number.

It is an amenable number.

1101399156 is an abundant number, since it is smaller than the sum of its proper divisors (2169437868).

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

1101399156 is a wasteful number, since it uses less digits than its factorization.

1101399156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213981 (or 213976 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 36.

The square root of 1101399156 is about 33187.3342707726. The cubic root of 1101399156 is about 1032.7176030251.

The spelling of 1101399156 in words is "one billion, one hundred one million, three hundred ninety-nine thousand, one hundred fifty-six".