199974505 has 4 divisors (see below), whose sum is σ = 239969412. Its totient is φ = 159979600.

The previous prime is 199974497. The next prime is 199974559. The reversal of 199974505 is 505479991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56430144 + 143544361 = 7512^2 + 11981^2 .

It is not a de Polignac number, because 199974505 - 2³ = 199974497 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19997446 + ... + 19997455.

It is an arithmetic number, because the mean of its divisors is an integer number (59992353).

Almost surely, 2^199974505 is an apocalyptic number.

It is an amenable number.

199974505 is a deficient number, since it is larger than the sum of its proper divisors (39994907).

199974505 is an equidigital number, since it uses as much as digits as its factorization.

199974505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39994906.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 199974505 is about 14141.2342106338. The cubic root of 199974505 is about 584.7786973092.

The spelling of 199974505 in words is "one hundred ninety-nine million, nine hundred seventy-four thousand, five hundred five".