199999954 has 32 divisors (see below), whose sum is σ = 378556416. Its totient is φ = 76978320.

The previous prime is 199999949. The next prime is 199999957. The reversal of 199999954 is 459999991.

It is not an unprimeable number, because it can be changed into a prime (199999957) 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, 4959 + ... + 20605.

It is an arithmetic number, because the mean of its divisors is an integer number (11829888).

Almost surely, 2^199999954 is an apocalyptic number.

199999954 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

199999954 is a deficient number, since it is larger than the sum of its proper divisors (178556462).

199999954 is a wasteful number, since it uses less digits than its factorization.

199999954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15750.

The product of its digits is 10628820, while the sum is 64.

The square root of 199999954 is about 14142.1339973853. The cubic root of 199999954 is about 584.8035028076.

The spelling of 199999954 in words is "one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-four".