199621090 has 32 divisors (see below), whose sum is σ = 371879424. Its totient is φ = 77070720.

The previous prime is 199621069. The next prime is 199621091. The reversal of 199621090 is 90126991.

It is not an unprimeable number, because it can be changed into a prime (199621091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181422 + ... + 182518.

It is an arithmetic number, because the mean of its divisors is an integer number (11621232).

Almost surely, 2^199621090 is an apocalyptic number.

199621090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199621090 is a deficient number, since it is larger than the sum of its proper divisors (172258334).

199621090 is a wasteful number, since it uses less digits than its factorization.

199621090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 199621090 is about 14128.7327811096. The cubic root of 199621090 is about 584.4340009823.

The spelling of 199621090 in words is "one hundred ninety-nine million, six hundred twenty-one thousand, ninety".