199930537 has 4 divisors (see below), whose sum is σ = 199959696. Its totient is φ = 199901380.

The previous prime is 199930531. The next prime is 199930541. The reversal of 199930537 is 735039991.

It is the 5773-rd star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 735039991 = 7 ⋅105005713.

It is a cyclic number.

It is not a de Polignac number, because 199930537 - 2²⁷ = 65712809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199930531) 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, 1962 + ... + 20092.

It is an arithmetic number, because the mean of its divisors is an integer number (49989924).

Almost surely, 2^199930537 is an apocalyptic number.

It is an amenable number.

199930537 is a deficient number, since it is larger than the sum of its proper divisors (29159).

199930537 is a wasteful number, since it uses less digits than its factorization.

199930537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29158.

The product of its (nonzero) digits is 229635, while the sum is 46.

The square root of 199930537 is about 14139.6795225352. The cubic root of 199930537 is about 584.7358361215.

The spelling of 199930537 in words is "one hundred ninety-nine million, nine hundred thirty thousand, five hundred thirty-seven".