199621616 has 40 divisors (see below), whose sum is σ = 423655920. Its totient is φ = 90696704.

The previous prime is 199621607. The next prime is 199621621. The reversal of 199621616 is 616126991.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4766 + ... + 20541.

It is an arithmetic number, because the mean of its divisors is an integer number (10591398).

Almost surely, 2^199621616 is an apocalyptic number.

199621616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

199621616 is an abundant number, since it is smaller than the sum of its proper divisors (224034304).

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

199621616 is a wasteful number, since it uses less digits than its factorization.

199621616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25361 (or 25355 counting only the distinct ones).

The product of its digits is 34992, while the sum is 41.

The square root of 199621616 is about 14128.7513956471. The cubic root of 199621616 is about 584.4345143082.

The spelling of 199621616 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, six hundred sixteen".