199993274 has 16 divisors (see below), whose sum is σ = 329163912. Its totient is φ = 90562368.

The previous prime is 199993273. The next prime is 199993279. The reversal of 199993274 is 472399991.

It can be written as a sum of positive squares in 4 ways, for example, as 128709025 + 71284249 = 11345^2 + 8443^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (199993271) by changing a digit.

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, 71189 + ... + 73944.

Almost surely, 2^199993274 is an apocalyptic number.

199993274 is a deficient number, since it is larger than the sum of its proper divisors (129170638).

199993274 is a wasteful number, since it uses less digits than its factorization.

199993274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145201.

The product of its digits is 1102248, while the sum is 53.

The square root of 199993274 is about 14141.8978217211. The cubic root of 199993274 is about 584.7969919213.

The spelling of 199993274 in words is "one hundred ninety-nine million, nine hundred ninety-three thousand, two hundred seventy-four".