199043478 has 24 divisors (see below), whose sum is σ = 432260400. Its totient is φ = 66194064.

The previous prime is 199043477. The next prime is 199043489. The reversal of 199043478 is 874340991.

It is a super-2 number, since 2×199043478² = 79236612268672968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199043477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4693 + ... + 20496.

It is an arithmetic number, because the mean of its divisors is an integer number (18010850).

Almost surely, 2^199043478 is an apocalyptic number.

199043478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

199043478 is an abundant number, since it is smaller than the sum of its proper divisors (233216922).

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

199043478 is a wasteful number, since it uses less digits than its factorization.

199043478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25636 (or 25633 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 199043478 is about 14108.2769323543. The cubic root of 199043478 is about 583.8697616469.

The spelling of 199043478 in words is "one hundred ninety-nine million, forty-three thousand, four hundred seventy-eight".