388227981 has 8 divisors (see below), whose sum is σ = 517728960. Its totient is φ = 258772832.

The previous prime is 388227979. The next prime is 388228019. The reversal of 388227981 is 189722883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388227981 - 2¹ = 388227979 is a prime.

It is a super-2 number, since 2×388227981² = 301441930462672722, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 388227981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388227481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23905 + ... + 36713.

It is an arithmetic number, because the mean of its divisors is an integer number (64716120).

Almost surely, 2^388227981 is an apocalyptic number.

It is an amenable number.

388227981 is a deficient number, since it is larger than the sum of its proper divisors (129500979).

388227981 is a wasteful number, since it uses less digits than its factorization.

388227981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22915.

The product of its digits is 387072, while the sum is 48.

The square root of 388227981 is about 19703.5017446138. The cubic root of 388227981 is about 729.5061280783.

The spelling of 388227981 in words is "three hundred eighty-eight million, two hundred twenty-seven thousand, nine hundred eighty-one".