388085986 has 4 divisors (see below), whose sum is σ = 582128982. Its totient is φ = 194042992.

The previous prime is 388085977. The next prime is 388085987. The reversal of 388085986 is 689580883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689580883 = 21863 ⋅31541.

It can be written as a sum of positive squares in only one way, i.e., 335073025 + 53012961 = 18305^2 + 7281^2 .

It is a super-2 number, since 2×388085986² = 301221465059184392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388085987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97021495 + ... + 97021498.

Almost surely, 2^388085986 is an apocalyptic number.

388085986 is a deficient number, since it is larger than the sum of its proper divisors (194042996).

388085986 is a wasteful number, since it uses less digits than its factorization.

388085986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194042995.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The square root of 388085986 is about 19699.8981215640. The cubic root of 388085986 is about 729.4171778916.

The spelling of 388085986 in words is "three hundred eighty-eight million, eighty-five thousand, nine hundred eighty-six".