194639997 has 16 divisors (see below), whose sum is σ = 270365760. Its totient is φ = 124444800.

The previous prime is 194639993. The next prime is 194639999. The reversal of 194639997 is 799936491.

It is not a de Polignac number, because 194639997 - 2² = 194639993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194639993) 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, 6154 + ... + 20667.

It is an arithmetic number, because the mean of its divisors is an integer number (16897860).

Almost surely, 2^194639997 is an apocalyptic number.

It is an amenable number.

194639997 is a deficient number, since it is larger than the sum of its proper divisors (75725763).

194639997 is a wasteful number, since it uses less digits than its factorization.

194639997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26924.

The product of its digits is 3306744, while the sum is 57.

The square root of 194639997 is about 13951.3439137597. The cubic root of 194639997 is about 579.5319221899.

The spelling of 194639997 in words is "one hundred ninety-four million, six hundred thirty-nine thousand, nine hundred ninety-seven".