1090806639 has 16 divisors (see below), whose sum is σ = 1566909792. Its totient is φ = 670998528.

The previous prime is 1090806637. The next prime is 1090806653. The reversal of 1090806639 is 9366080901.

It is not a de Polignac number, because 1090806639 - 2¹ = 1090806637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1090806639.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145839 + ... + 153135.

It is an arithmetic number, because the mean of its divisors is an integer number (97931862).

Almost surely, 2^1090806639 is an apocalyptic number.

1090806639 is a deficient number, since it is larger than the sum of its proper divisors (476103153).

1090806639 is a wasteful number, since it uses less digits than its factorization.

1090806639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11146.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 1090806639 is about 33027.3619745810. The cubic root of 1090806639 is about 1029.3962713895.

The spelling of 1090806639 in words is "one billion, ninety million, eight hundred six thousand, six hundred thirty-nine".