199911954 has 16 divisors (see below), whose sum is σ = 436171680. Its totient is φ = 60579360.

The previous prime is 199911947. The next prime is 199911973. The reversal of 199911954 is 459119991.

199911954 = 2110² + 2111² + ... + 2153².

It is a happy number.

199911954 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514419 + ... + 1514550.

It is an arithmetic number, because the mean of its divisors is an integer number (27260730).

Almost surely, 2^199911954 is an apocalyptic number.

199911954 is an abundant number, since it is smaller than the sum of its proper divisors (236259726).

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

199911954 is a wasteful number, since it uses less digits than its factorization.

199911954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028985.

The product of its digits is 131220, while the sum is 48.

The square root of 199911954 is about 14139.0223848751. The cubic root of 199911954 is about 584.7177190246.

It can be divided in two parts, 19991 and 1954, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 199911954 in words is "one hundred ninety-nine million, nine hundred eleven thousand, nine hundred fifty-four".