388225691 has 4 divisors (see below), whose sum is σ = 443686512. Its totient is φ = 332764872.

The previous prime is 388225661. The next prime is 388225693. The reversal of 388225691 is 196522883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196522883 = 373 ⋅526871.

It is a cyclic number.

It is not a de Polignac number, because 388225691 - 2²² = 384031387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388225693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27730400 + ... + 27730413.

It is an arithmetic number, because the mean of its divisors is an integer number (110921628).

Almost surely, 2^388225691 is an apocalyptic number.

388225691 is a deficient number, since it is larger than the sum of its proper divisors (55460821).

388225691 is an equidigital number, since it uses as much as digits as its factorization.

388225691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55460820.

The product of its digits is 207360, while the sum is 44.

The square root of 388225691 is about 19703.4436330302. The cubic root of 388225691 is about 729.5046937215.

The spelling of 388225691 in words is "three hundred eighty-eight million, two hundred twenty-five thousand, six hundred ninety-one".