194138636 has 12 divisors (see below), whose sum is σ = 347643912. Its totient is φ = 94811808.

The previous prime is 194138621. The next prime is 194138639. The reversal of 194138636 is 636831491.

It is a junction number, because it is equal to n+sod(n) for n = 194138593 and 194138602.

It is not an unprimeable number, because it can be changed into a prime (194138639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564185 + ... + 564528.

It is an arithmetic number, because the mean of its divisors is an integer number (28970326).

Almost surely, 2^194138636 is an apocalyptic number.

It is an amenable number.

194138636 is a deficient number, since it is larger than the sum of its proper divisors (153505276).

194138636 is a wasteful number, since it uses less digits than its factorization.

194138636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128760 (or 1128758 counting only the distinct ones).

The product of its digits is 93312, while the sum is 41.

The square root of 194138636 is about 13933.3641307475. The cubic root of 194138636 is about 579.0339009883.

The spelling of 194138636 in words is "one hundred ninety-four million, one hundred thirty-eight thousand, six hundred thirty-six".