1099643658 has 32 divisors (see below), whose sum is σ = 2316686400. Its totient is φ = 347008896.

The previous prime is 1099643651. The next prime is 1099643659. The reversal of 1099643658 is 8563469901.

It is a self number, because there is not a number n which added to its sum of digits gives 1099643658.

It is not an unprimeable number, because it can be changed into a prime (1099643651) 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, 222478 + ... + 227366.

It is an arithmetic number, because the mean of its divisors is an integer number (72396450).

Almost surely, 2^1099643658 is an apocalyptic number.

1099643658 is an abundant number, since it is smaller than the sum of its proper divisors (1217042742).

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

1099643658 is a wasteful number, since it uses less digits than its factorization.

1099643658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6886.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 1099643658 is about 33160.8754106402. The cubic root of 1099643658 is about 1032.1686353082.

The spelling of 1099643658 in words is "one billion, ninety-nine million, six hundred forty-three thousand, six hundred fifty-eight".