199640279 has 16 divisors (see below), whose sum is σ = 209986560. Its totient is φ = 189578880.

The previous prime is 199640249. The next prime is 199640291. The reversal of 199640279 is 972046991.

It is a cyclic number.

It is not a de Polignac number, because 199640279 - 2²⁴ = 182863063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199640249) 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, 460847 + ... + 461279.

It is an arithmetic number, because the mean of its divisors is an integer number (13124160).

Almost surely, 2^199640279 is an apocalyptic number.

199640279 is a deficient number, since it is larger than the sum of its proper divisors (10346281).

199640279 is a wasteful number, since it uses less digits than its factorization.

199640279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 199640279 is about 14129.4118419699. The cubic root of 199640279 is about 584.4527270343.

The spelling of 199640279 in words is "one hundred ninety-nine million, six hundred forty thousand, two hundred seventy-nine".