194397138 has 32 divisors (see below), whose sum is σ = 465225600. Its totient is φ = 59814288.

The previous prime is 194397131. The next prime is 194397157. The reversal of 194397138 is 831793491.

194397138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 194397093 and 194397102.

It is not an unprimeable number, because it can be changed into a prime (194397131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137758 + ... + 139161.

It is an arithmetic number, because the mean of its divisors is an integer number (14538300).

Almost surely, 2^194397138 is an apocalyptic number.

194397138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

194397138 is an abundant number, since it is smaller than the sum of its proper divisors (270828462).

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

194397138 is a wasteful number, since it uses less digits than its factorization.

194397138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276943 (or 276937 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 194397138 is about 13942.6374119103. The cubic root of 194397138 is about 579.2907879196.

The spelling of 194397138 in words is "one hundred ninety-four million, three hundred ninety-seven thousand, one hundred thirty-eight".