196639690 has 64 divisors (see below), whose sum is σ = 396264960. Its totient is φ = 69788160.

The previous prime is 196639609. The next prime is 196639741. The reversal of 196639690 is 96936691.

It is a super-2 number, since 2×196639690² = 77334335366592200, which contains 22 as substring.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 420837 + ... + 421303.

It is an arithmetic number, because the mean of its divisors is an integer number (6191640).

Almost surely, 2^196639690 is an apocalyptic number.

196639690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

196639690 is an abundant number, since it is smaller than the sum of its proper divisors (199625270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

196639690 is a wasteful number, since it uses less digits than its factorization.

196639690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 472392, while the sum is 49.

The square root of 196639690 is about 14022.8274609652. The cubic root of 196639690 is about 581.5098296466.

The spelling of 196639690 in words is "one hundred ninety-six million, six hundred thirty-nine thousand, six hundred ninety".