199864690 has 8 divisors (see below), whose sum is σ = 359756460. Its totient is φ = 79945872.

The previous prime is 199864673. The next prime is 199864697. The reversal of 199864690 is 96468991.

It can be written as a sum of positive squares in 2 ways, for example, as 185749641 + 14115049 = 13629^2 + 3757^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×199864690² = 79891788617592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199864697) 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, 9993225 + ... + 9993244.

Almost surely, 2^199864690 is an apocalyptic number.

199864690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199864690 is a deficient number, since it is larger than the sum of its proper divisors (159891770).

199864690 is a wasteful number, since it uses less digits than its factorization.

199864690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19986476.

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 199864690 is about 14137.3508833869. The cubic root of 199864690 is about 584.6716349429.

The spelling of 199864690 in words is "one hundred ninety-nine million, eight hundred sixty-four thousand, six hundred ninety".