1090806638 has 16 divisors (see below), whose sum is σ = 1693597680. Its totient is φ = 526295616.

The previous prime is 1090806637. The next prime is 1090806653. The reversal of 1090806638 is 8366080901.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1090806595 and 1090806604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1090806631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123506 + ... + 132042.

It is an arithmetic number, because the mean of its divisors is an integer number (105849855).

Almost surely, 2^1090806638 is an apocalyptic number.

1090806638 is a deficient number, since it is larger than the sum of its proper divisors (602791042).

1090806638 is a wasteful number, since it uses less digits than its factorization.

1090806638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1090806638 is about 33027.3619594421. The cubic root of 1090806638 is about 1029.3962710749.

The spelling of 1090806638 in words is "one billion, ninety million, eight hundred six thousand, six hundred thirty-eight".