194951690 has 8 divisors (see below), whose sum is σ = 350913060. Its totient is φ = 77980672.

The previous prime is 194951651. The next prime is 194951707. The reversal of 194951690 is 96159491.

It can be written as a sum of positive squares in 2 ways, for example, as 192071881 + 2879809 = 13859^2 + 1697^2 .

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

It is a super-2 number, since 2×194951690² = 76012322867712200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9747575 + ... + 9747594.

Almost surely, 2^194951690 is an apocalyptic number.

194951690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

194951690 is a deficient number, since it is larger than the sum of its proper divisors (155961370).

194951690 is a wasteful number, since it uses less digits than its factorization.

194951690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19495176.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 194951690 is about 13962.5101611422. The cubic root of 194951690 is about 579.8411078822.

The spelling of 194951690 in words is "one hundred ninety-four million, nine hundred fifty-one thousand, six hundred ninety".