388672385 has 4 divisors (see below), whose sum is σ = 466406868. Its totient is φ = 310937904.

The previous prime is 388672381. The next prime is 388672387. The reversal of 388672385 is 583276883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583276883 = 7 ⋅83325269.

It can be written as a sum of positive squares in 2 ways, for example, as 180418624 + 208253761 = 13432^2 + 14431^2 .

It is a cyclic number.

It is not a de Polignac number, because 388672385 - 2² = 388672381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388672381) 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, 38867234 + ... + 38867243.

It is an arithmetic number, because the mean of its divisors is an integer number (116601717).

Almost surely, 2^388672385 is an apocalyptic number.

It is an amenable number.

388672385 is a deficient number, since it is larger than the sum of its proper divisors (77734483).

388672385 is an equidigital number, since it uses as much as digits as its factorization.

388672385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77734482.

The product of its digits is 1935360, while the sum is 50.

The square root of 388672385 is about 19714.7758039497. The cubic root of 388672385 is about 729.7843767996.

The spelling of 388672385 in words is "three hundred eighty-eight million, six hundred seventy-two thousand, three hundred eighty-five".