1099121406 has 8 divisors (see below), whose sum is σ = 2198242824. Its totient is φ = 366373800.

The previous prime is 1099121389. The next prime is 1099121407. The reversal of 1099121406 is 6041219901.

It is a sphenic number, since it is the product of 3 distinct primes.

1099121406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099121407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91593445 + ... + 91593456.

It is an arithmetic number, because the mean of its divisors is an integer number (274780353).

Almost surely, 2^1099121406 is an apocalyptic number.

1099121406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1099121406 is a wasteful number, since it uses less digits than its factorization.

1099121406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183186906.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1099121406 is about 33152.9999547552. Note that the first 4 decimals coincide. The cubic root of 1099121406 is about 1032.0052073681.

The spelling of 1099121406 in words is "one billion, ninety-nine million, one hundred twenty-one thousand, four hundred six".