194239657 has 4 divisors (see below), whose sum is σ = 194466640. Its totient is φ = 194012676.

The previous prime is 194239649. The next prime is 194239663. The reversal of 194239657 is 756932491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 194239657 - 2³ = 194239649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194239667) 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, 112203 + ... + 113920.

It is an arithmetic number, because the mean of its divisors is an integer number (48616660).

Almost surely, 2^194239657 is an apocalyptic number.

It is an amenable number.

194239657 is a deficient number, since it is larger than the sum of its proper divisors (226983).

194239657 is an equidigital number, since it uses as much as digits as its factorization.

194239657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226982.

The product of its digits is 408240, while the sum is 46.

The square root of 194239657 is about 13936.9888067688. The cubic root of 194239657 is about 579.1343179581.

The spelling of 194239657 in words is "one hundred ninety-four million, two hundred thirty-nine thousand, six hundred fifty-seven".