11438990855 has 32 divisors (see below), whose sum is σ = 15408714240. Its totient is φ = 8109711360.

The previous prime is 11438990851. The next prime is 11438990881. The reversal of 11438990855 is 55809983411.

It is a happy number.

It is not a de Polignac number, because 11438990855 - 2² = 11438990851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11438990797 and 11438990806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11438990851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38831 + ... + 156159.

It is an arithmetic number, because the mean of its divisors is an integer number (481522320).

Almost surely, 2^11438990855 is an apocalyptic number.

11438990855 is a deficient number, since it is larger than the sum of its proper divisors (3969723385).

11438990855 is a wasteful number, since it uses less digits than its factorization.

11438990855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117419.

The product of its (nonzero) digits is 1555200, while the sum is 53.

It can be divided in two parts, 1143 and 8990855, that added together give a palindrome (8991998).

The spelling of 11438990855 in words is "eleven billion, four hundred thirty-eight million, nine hundred ninety thousand, eight hundred fifty-five".