199620539 has 4 divisors (see below), whose sum is σ = 199986024. Its totient is φ = 199255056.

The previous prime is 199620523. The next prime is 199620557. The reversal of 199620539 is 935026991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935026991 = 31 ⋅30162161.

It is a cyclic number.

It is not a de Polignac number, because 199620539 - 2⁴ = 199620523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199620539.

It is not an unprimeable number, because it can be changed into a prime (199625539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181922 + ... + 183015.

It is an arithmetic number, because the mean of its divisors is an integer number (49996506).

Almost surely, 2^199620539 is an apocalyptic number.

199620539 is a deficient number, since it is larger than the sum of its proper divisors (365485).

199620539 is an equidigital number, since it uses as much as digits as its factorization.

199620539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365484.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 199620539 is about 14128.7132818244. The cubic root of 199620539 is about 584.4334632578.

The spelling of 199620539 in words is "one hundred ninety-nine million, six hundred twenty thousand, five hundred thirty-nine".