188397797 has 12 divisors (see below), whose sum is σ = 222874560. Its totient is φ = 158744376.

The previous prime is 188397779. The next prime is 188397823. The reversal of 188397797 is 797793881.

It is a de Polignac number, because none of the positive numbers 2^k-188397797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188397767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29693 + ... + 35474.

It is an arithmetic number, because the mean of its divisors is an integer number (18572880).

Almost surely, 2^188397797 is an apocalyptic number.

It is an amenable number.

188397797 is a deficient number, since it is larger than the sum of its proper divisors (34476763).

188397797 is an equidigital number, since it uses as much as digits as its factorization.

188397797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65240 (or 65233 counting only the distinct ones).

The product of its digits is 5334336, while the sum is 59.

The square root of 188397797 is about 13725.8076993669. The cubic root of 188397797 is about 573.2691968623.

The spelling of 188397797 in words is "one hundred eighty-eight million, three hundred ninety-seven thousand, seven hundred ninety-seven".